FALSE2022FY0000310158P3M0.1http://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#SellingGeneralAndAdministrativeExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#RestructuringChargeshttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#DeferredIncomeTaxesAndOtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#DeferredIncomeTaxesAndOtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#OtherAssetsCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2022#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2022#OtherNonoperatingIncomeExpensehttp://fasb.org/us-gaap/2022#CostOfGoodsAndServicesSoldhttp://fasb.org/us-gaap/2022#ResearchAndDevelopmentExpensehttp://fasb.org/us-gaap/2022#DeferredIncomeTaxesAndOtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#DeferredIncomeTaxesAndOtherAssetsNoncurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrenthttp://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrent33.3300003101582022-01-012022-12-310000310158mrk:A0.500Notesdue2024Member2022-01-012022-12-310000310158mrk:A1.875Notesdue2026Member2022-01-012022-12-310000310158mrk:A2.500Notesdue2034Member2022-01-012022-12-310000310158mrk:A1.375Notesdue2036Member2022-01-012022-12-3100003101582023-01-31xbrli:shares00003101582022-06-30iso4217:USD00003101582021-01-012021-12-3100003101582020-01-012020-12-31iso4217:USDxbrli:shares00003101582022-12-3100003101582021-12-310000310158us-gaap:CommonStockMember2019-12-310000310158us-gaap:AdditionalPaidInCapitalMember2019-12-310000310158us-gaap:RetainedEarningsMember2019-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000310158us-gaap:TreasuryStockCommonMember2019-12-310000310158us-gaap:NoncontrollingInterestMember2019-12-3100003101582019-12-310000310158us-gaap:RetainedEarningsMember2020-01-012020-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000310158us-gaap:TreasuryStockCommonMember2020-01-012020-12-310000310158us-gaap:NoncontrollingInterestMember2020-01-012020-12-310000310158us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310000310158us-gaap:CommonStockMember2020-12-310000310158us-gaap:AdditionalPaidInCapitalMember2020-12-310000310158us-gaap:RetainedEarningsMember2020-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000310158us-gaap:TreasuryStockCommonMember2020-12-310000310158us-gaap:NoncontrollingInterestMember2020-12-3100003101582020-12-310000310158us-gaap:RetainedEarningsMember2021-01-012021-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310000310158us-gaap:TreasuryStockCommonMember2021-01-012021-12-310000310158us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310000310158us-gaap:NoncontrollingInterestMember2021-01-012021-12-310000310158us-gaap:CommonStockMember2021-12-310000310158us-gaap:AdditionalPaidInCapitalMember2021-12-310000310158us-gaap:RetainedEarningsMember2021-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000310158us-gaap:TreasuryStockCommonMember2021-12-310000310158us-gaap:NoncontrollingInterestMember2021-12-310000310158us-gaap:RetainedEarningsMember2022-01-012022-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-12-310000310158us-gaap:NoncontrollingInterestMember2022-01-012022-12-310000310158us-gaap:AdditionalPaidInCapitalMember2022-01-012022-12-310000310158us-gaap:TreasuryStockCommonMember2022-01-012022-12-310000310158us-gaap:CommonStockMember2022-12-310000310158us-gaap:AdditionalPaidInCapitalMember2022-12-310000310158us-gaap:RetainedEarningsMember2022-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310000310158us-gaap:TreasuryStockCommonMember2022-12-310000310158us-gaap:NoncontrollingInterestMember2022-12-31mrk:segment0000310158srt:MinimumMember2022-01-012022-12-310000310158srt:MaximumMember2022-01-012022-12-310000310158country:USmrk:PharmaceuticalsegmentMembersrt:MinimumMember2022-01-012022-12-310000310158country:USmrk:AnimalHealthsegmentMembersrt:MinimumMember2022-01-012022-12-310000310158country:USsrt:MaximumMember2022-01-012022-12-310000310158us-gaap:NonUsMembersrt:MinimumMember2022-01-012022-12-310000310158us-gaap:NonUsMembersrt:MaximumMember2022-01-012022-12-310000310158us-gaap:BuildingMembersrt:MinimumMember2022-01-012022-12-310000310158us-gaap:BuildingMembersrt:MaximumMember2022-01-012022-12-310000310158us-gaap:MachineryAndEquipmentMembersrt:MinimumMember2022-01-012022-12-310000310158srt:MaximumMemberus-gaap:MachineryAndEquipmentMember2022-01-012022-12-310000310158us-gaap:SoftwareAndSoftwareDevelopmentCostsMembersrt:MinimumMember2022-01-012022-12-310000310158srt:MaximumMemberus-gaap:SoftwareAndSoftwareDevelopmentCostsMember2022-01-012022-12-310000310158mrk:OrganonCoMember2021-06-0200003101582021-06-020000310158mrk:TransitionServicesAgreementMembersrt:MinimumMember2021-06-022021-06-020000310158mrk:TransitionServicesAgreementMembersrt:MaximumMember2021-06-022021-06-020000310158mrk:ManufacturingAndSupplyAgreementsMembersrt:MinimumMember2021-06-022021-06-020000310158mrk:ManufacturingAndSupplyAgreementsMembersrt:MaximumMember2021-06-022021-06-020000310158mrk:OrganonCoMember2022-01-012022-12-310000310158mrk:OrganonCoMember2021-01-012021-12-310000310158mrk:OrganonCoMember2022-12-310000310158mrk:OrganonCoMember2021-12-310000310158mrk:OrganonCoMember2021-06-022021-06-02xbrli:pure0000310158us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:SubsequentEventMember2023-02-012023-02-240000310158us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:SubsequentEventMember2023-02-240000310158us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:SubsequentEventMember2023-01-310000310158mrk:ImagoBioSciencesIncMemberus-gaap:SubsequentEventMember2023-01-012023-01-310000310158mrk:ImagoBioSciencesIncMemberus-gaap:SubsequentEventMember2023-01-310000310158mrk:RoyaltyPharmaMember2022-10-012022-10-310000310158us-gaap:LicensingAgreementsMembermrk:ModernaMember2022-09-012022-09-300000310158mrk:OrnaTherapeuticsMemberus-gaap:LicensingAgreementsMember2022-08-012022-08-310000310158mrk:OrnaTherapeuticsMemberus-gaap:LicensingAgreementsMembermrk:DevelopmentMilestonesMember2022-08-012022-08-310000310158mrk:OrnaTherapeuticsMemberus-gaap:LicensingAgreementsMembermrk:RegulatoryMilestonesMember2022-08-012022-08-310000310158mrk:OrnaTherapeuticsMemberus-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMember2022-08-012022-08-310000310158mrk:OrnaTherapeuticsMemberus-gaap:LicensingAgreementsMember2022-10-012022-12-310000310158mrk:OrionCorporationMemberus-gaap:LicensingAgreementsMember2022-07-012022-07-310000310158us-gaap:LicensingAgreementsMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-07-012022-07-310000310158us-gaap:LicensingAgreementsMembermrk:DevelopmentMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-07-012022-07-310000310158us-gaap:LicensingAgreementsMembermrk:RegulatoryMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-07-012022-07-310000310158us-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-07-012022-07-310000310158us-gaap:LicensingAgreementsMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-05-012022-05-310000310158us-gaap:LicensingAgreementsMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-05-012022-12-310000310158us-gaap:LicensingAgreementsMembermrk:DevelopmentMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-05-012022-05-310000310158us-gaap:LicensingAgreementsMembermrk:FirstCommercialSaleMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-05-012022-05-310000310158us-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMember2022-05-012022-05-310000310158mrk:AcceleronPharmaIncMember2021-11-012021-11-300000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMember2021-11-012021-11-300000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMembersrt:MinimumMember2021-11-012021-11-300000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMembersrt:MaximumMember2021-11-012021-11-300000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMembermrk:RegulatoryMilestonesMember2022-01-012022-12-310000310158us-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMembermrk:BristolMyersSquibbMember2022-01-012022-12-310000310158mrk:AcceleronPharmaIncMember2021-11-300000310158mrk:AcceleronPharmaIncMember2021-11-190000310158mrk:AcceleronPharmaIncMemberus-gaap:MeasurementInputDiscountRateMember2021-11-190000310158mrk:PandionTherapeuticsMember2021-04-012021-04-300000310158mrk:PandionTherapeuticsMember2021-04-300000310158mrk:PandionTherapeuticsMember2021-01-012021-12-310000310158mrk:OralAndInjectableFormulationsMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:GileadSciencesMember2021-03-012021-03-310000310158us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:GileadSciencesMembermrk:OralFormulationMember2021-03-012021-03-310000310158mrk:InjectableFormulationMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:GileadSciencesMember2021-03-012021-03-310000310158us-gaap:LicensingAgreementsMembermrk:ArtivaBiotherapeuticsIncMember2021-01-012021-01-31mrk:research_programmrk:collaboration_target0000310158us-gaap:LicensingAgreementsMembermrk:DevelopmentMilestonesMembermrk:ArtivaBiotherapeuticsIncMember2021-01-012021-01-310000310158us-gaap:LicensingAgreementsMembermrk:RegulatoryMilestonesMembermrk:ArtivaBiotherapeuticsIncMember2021-01-012021-01-310000310158us-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMembermrk:ArtivaBiotherapeuticsIncMember2021-01-012021-01-310000310158us-gaap:LicensingAgreementsMembermrk:ArtivaBiotherapeuticsIncMembersrt:MinimumMember2021-01-012021-01-310000310158us-gaap:LicensingAgreementsMembersrt:MaximumMembermrk:ArtivaBiotherapeuticsIncMember2021-01-012021-01-310000310158mrk:OncoImmuneMember2020-12-012020-12-310000310158mrk:OncoImmuneMember2020-12-310000310158mrk:OncoImmuneMember2020-12-310000310158mrk:OncoImmuneMember2020-01-012020-12-310000310158mrk:COVID19Member2021-01-012021-12-310000310158mrk:VelosBioMember2020-12-012020-12-310000310158mrk:VelosBioMember2020-12-310000310158mrk:VelosBioMember2020-01-012020-12-310000310158mrk:VelosBioMember2021-01-012021-12-310000310158mrk:VelosBioMember2021-12-012021-12-310000310158mrk:VelosBioMember2021-12-310000310158mrk:SeagenMember2020-09-012020-09-300000310158mrk:SeagenMember2020-09-300000310158mrk:SeagenMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMember2020-01-012020-12-310000310158mrk:SeagenMembermrk:DevelopmentMilestonesMember2020-09-012020-09-300000310158mrk:SeagenMembermrk:SalesBasedMilestonesMember2020-09-012020-09-300000310158mrk:SeagenMembermrk:TukysaMember2020-09-012020-09-300000310158mrk:SeagenMembermrk:RegulatoryMilestonesMembermrk:TukysaMember2020-09-012020-09-300000310158mrk:SeagenMembermrk:TukysaMembersrt:MinimumMember2020-09-012020-09-300000310158mrk:SeagenMembersrt:MaximumMembermrk:TukysaMember2020-09-012020-09-300000310158mrk:DunboyneMember2020-09-012020-09-30iso4217:EUR0000310158mrk:DunboyneMember2020-09-300000310158mrk:SentinelMember2020-07-012020-07-310000310158mrk:SentinelMemberus-gaap:DevelopedTechnologyRightsMember2020-07-012020-07-310000310158mrk:SentinelMember2020-07-310000310158mrk:SentinelMemberus-gaap:DevelopedTechnologyRightsMember2020-07-012020-07-310000310158mrk:ThemisMember2020-06-012020-06-300000310158mrk:ThemisMember2020-06-300000310158mrk:COVID19Membermrk:ThemisMember2020-01-012020-12-310000310158mrk:IAVIMember2020-05-012020-05-310000310158mrk:COVID19Member2020-01-012020-12-310000310158mrk:ArQuleMember2020-01-012020-01-310000310158mrk:ArQuleMember2020-01-310000310158mrk:ArQuleMember2020-01-160000310158mrk:ArQuleMemberus-gaap:MeasurementInputDiscountRateMember2020-01-160000310158mrk:LynparzaMembermrk:SalesBasedMilestonesMembermrk:AstraZenecaMember2022-01-012022-12-310000310158mrk:LynparzaMembermrk:SalesBasedMilestonesMembermrk:AstraZenecaMember2022-12-310000310158mrk:LynparzaMember2022-01-012022-12-310000310158mrk:LynparzaMembermrk:SalesBasedMilestonesMembermrk:AstraZenecaMember2020-01-012020-12-310000310158mrk:LynparzaMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:AstraZenecaMember2022-12-310000310158mrk:RegulatoryMilestonesMembermrk:LynparzaMembermrk:AstraZenecaMember2022-01-012022-12-310000310158mrk:RegulatoryMilestonesMembermrk:LynparzaMembermrk:AstraZenecaMember2020-01-012020-12-310000310158mrk:LynparzaMemberus-gaap:LicenseMember2022-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AlliancerevenueLynparzaMember2022-01-012022-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AlliancerevenueLynparzaMember2021-01-012021-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AlliancerevenueLynparzaMember2020-01-012020-12-310000310158mrk:AllianceRevenueKoselugoMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:AllianceRevenueKoselugoMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:AllianceRevenueKoselugoMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2020-01-012020-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158us-gaap:OtherCurrentAssetsMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158us-gaap:OtherCurrentAssetsMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158us-gaap:OtherNoncurrentLiabilitiesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158us-gaap:OtherNoncurrentLiabilitiesMembermrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:LynparzaMember2020-01-012020-12-310000310158mrk:EisaiMember2021-03-012021-03-310000310158mrk:SalesBasedMilestonesMembermrk:EisaiMembermrk:LenvimaMember2022-01-012022-12-310000310158mrk:SalesBasedMilestonesMembermrk:EisaiMembermrk:LenvimaMember2021-01-012021-12-310000310158mrk:SalesBasedMilestonesMembermrk:EisaiMembermrk:LenvimaMember2020-01-012020-12-310000310158us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:EisaiMembermrk:LenvimaMember2022-12-310000310158mrk:RegulatoryMilestonesMembermrk:EisaiMembermrk:LenvimaMember2022-01-012022-12-310000310158mrk:RegulatoryMilestonesMembermrk:EisaiMembermrk:LenvimaMember2021-01-012021-12-310000310158mrk:RegulatoryMilestonesMembermrk:EisaiMembermrk:LenvimaMember2020-01-012020-12-310000310158us-gaap:LicenseMembermrk:LenvimaMember2022-12-310000310158us-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:EisaiMember2022-01-012022-12-310000310158us-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:EisaiMember2021-01-012021-12-310000310158us-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:EisaiMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2020-01-012020-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2022-01-012022-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2021-01-012021-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2020-01-012020-12-310000310158us-gaap:OtherCurrentAssetsMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2022-12-310000310158us-gaap:OtherCurrentAssetsMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2021-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2022-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMembermrk:EisaiMember2021-12-310000310158mrk:AdempasMembermrk:BayerAGMembermrk:SalesBasedMilestonesMember2022-01-012022-12-310000310158mrk:AdempasMembermrk:BayerAGMembermrk:SalesBasedMilestonesMember2020-01-012020-12-310000310158mrk:AdempasMemberus-gaap:OtherIntangibleAssetsMember2022-12-310000310158mrk:VerquvoMemberus-gaap:OtherIntangibleAssetsMember2022-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2020-01-012020-12-310000310158mrk:AdempasMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:AdempasMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:AdempasMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2020-01-012020-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:VerquvoMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:VerquvoMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:VerquvoMemberus-gaap:SalesMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158mrk:BayerAGMemberus-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158mrk:BayerAGMemberus-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158mrk:BayerAGMemberus-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158mrk:BayerAGMemberus-gaap:OtherCurrentAssetsMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158mrk:BayerAGMemberus-gaap:OtherCurrentAssetsMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:BayerAGMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-12-310000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-12-310000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2020-01-012020-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2022-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMembersrt:MinimumMember2022-01-012022-12-310000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMembersrt:MaximumMember2022-01-012022-12-310000310158us-gaap:LicensingAgreementsMembermrk:BristolMyersSquibbMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ReblozylMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ReblozylMember2021-01-012021-12-310000310158srt:ScenarioForecastMember2023-12-310000310158us-gaap:CostOfSalesMembermrk:AcceleratedDepreciationMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OtherRestructuringMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OneTimeTerminationBenefitsMember2022-01-012022-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AcceleratedDepreciationMember2022-01-012022-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AcceleratedDepreciationMember2022-01-012022-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-12-310000310158us-gaap:RestructuringChargesMember2022-01-012022-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2022-01-012022-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:RestructuringChargesMember2022-01-012022-12-310000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2022-01-012022-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2022-01-012022-12-310000310158mrk:AcceleratedDepreciationMember2022-01-012022-12-310000310158us-gaap:OtherRestructuringMember2022-01-012022-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OtherRestructuringMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMembermrk:AcceleratedDepreciationMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OneTimeTerminationBenefitsMember2021-01-012021-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AcceleratedDepreciationMember2021-01-012021-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AcceleratedDepreciationMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:RestructuringChargesMember2021-01-012021-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2021-01-012021-12-310000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2021-01-012021-12-310000310158us-gaap:RestructuringChargesMember2021-01-012021-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2021-01-012021-12-310000310158mrk:AcceleratedDepreciationMember2021-01-012021-12-310000310158us-gaap:OtherRestructuringMember2021-01-012021-12-310000310158us-gaap:CostOfSalesMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OtherRestructuringMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMemberus-gaap:OneTimeTerminationBenefitsMember2020-01-012020-12-310000310158us-gaap:CostOfSalesMembermrk:AcceleratedDepreciationMember2020-01-012020-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2020-01-012020-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMembermrk:AcceleratedDepreciationMember2020-01-012020-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2020-01-012020-12-310000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2020-01-012020-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2020-01-012020-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMembermrk:AcceleratedDepreciationMember2020-01-012020-12-310000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2020-01-012020-12-310000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2020-01-012020-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:RestructuringChargesMember2020-01-012020-12-310000310158us-gaap:RestructuringChargesMember2020-01-012020-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2020-01-012020-12-310000310158mrk:AcceleratedDepreciationMember2020-01-012020-12-310000310158us-gaap:OtherRestructuringMember2020-01-012020-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2020-12-310000310158mrk:AcceleratedDepreciationMember2020-12-310000310158us-gaap:OtherRestructuringMember2020-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2021-12-310000310158mrk:AcceleratedDepreciationMember2021-12-310000310158us-gaap:OtherRestructuringMember2021-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2022-12-310000310158mrk:AcceleratedDepreciationMember2022-12-310000310158us-gaap:OtherRestructuringMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMembersrt:MaximumMember2022-01-012022-12-310000310158srt:MaximumMemberus-gaap:NondesignatedMember2022-01-012022-12-310000310158us-gaap:ForeignExchangeContractMember2022-01-012022-12-310000310158us-gaap:ForeignExchangeContractMember2021-01-012021-12-310000310158us-gaap:ForeignExchangeContractMember2020-01-012020-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2022-01-012022-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2021-01-012021-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2020-01-012020-12-310000310158mrk:EurodominatedNotesMember2022-01-012022-12-310000310158mrk:EurodominatedNotesMember2021-01-012021-12-310000310158mrk:EurodominatedNotesMember2020-01-012020-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMembermrk:EurodominatedNotesMember2022-01-012022-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMembermrk:EurodominatedNotesMember2021-01-012021-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMembermrk:EurodominatedNotesMember2020-01-012020-12-310000310158us-gaap:InterestRateSwapMember2022-01-012022-12-31mrk:interest_rate_swap0000310158mrk:A2.40NotesDue2022Member2022-12-310000310158mrk:A2.35NotesDue2022Member2022-12-310000310158mrk:LongTermDebtCurrentMaturitiesMember2022-12-310000310158mrk:LongTermDebtCurrentMaturitiesMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMembermrk:DeferredIncomeTaxesAndOtherAssetsNoncurrentMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMembermrk:DeferredIncomeTaxesAndOtherAssetsNoncurrentMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2022-12-310000310158us-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMember2022-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMember2021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMemberus-gaap:NondesignatedMember2022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMemberus-gaap:NondesignatedMember2021-12-310000310158us-gaap:OtherCurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2022-12-310000310158us-gaap:OtherCurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:NondesignatedMember2021-12-310000310158us-gaap:NondesignatedMember2022-12-310000310158us-gaap:NondesignatedMember2021-12-310000310158us-gaap:InterestRateSwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2022-01-012022-12-310000310158us-gaap:InterestRateSwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2021-01-012021-12-310000310158us-gaap:InterestRateSwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2020-01-012020-12-310000310158us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2022-01-012022-12-310000310158us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2021-01-012021-12-310000310158us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:ForeignExchangeContractMember2020-01-012020-12-310000310158us-gaap:InterestRateSwapMember2021-01-012021-12-310000310158us-gaap:InterestRateSwapMember2020-01-012020-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:SalesMember2022-01-012022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:SalesMember2021-01-012021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:SalesMember2020-01-012020-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2022-01-012022-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2021-01-012021-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateContractMember2020-01-012020-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:ForwardContractsMember2022-01-012022-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:ForwardContractsMember2021-01-012021-12-310000310158us-gaap:ResearchAndDevelopmentExpenseMemberus-gaap:ForwardContractsMember2020-01-012020-12-310000310158us-gaap:CommercialPaperMember2022-12-310000310158us-gaap:CommercialPaperMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMember2022-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-12-310000310158us-gaap:CorporateDebtSecuritiesMember2022-12-310000310158us-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMember2022-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:CommercialPaperMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMember2022-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:ForeignExchangeOptionMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMember2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMember2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2022-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:InterestRateContractMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2021-12-310000310158us-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:SanofiPasteurMember2022-12-310000310158mrk:SanofiPasteurMember2021-12-310000310158us-gaap:AccountsReceivableMemberus-gaap:CustomerConcentrationRiskMembermrk:McKessonCorporationMember2022-01-012022-12-310000310158us-gaap:AccountsReceivableMemberus-gaap:CustomerConcentrationRiskMembermrk:AmerisourceBergenCorporationMember2022-01-012022-12-310000310158us-gaap:AccountsReceivableMemberus-gaap:CustomerConcentrationRiskMembermrk:CardinalHealthIncMember2022-01-012022-12-3100003101582022-10-012022-12-3100003101582021-10-012021-12-310000310158mrk:InventoryNotExpectedtobeSoldWithinOneYearMember2022-12-310000310158mrk:InventoryNotExpectedtobeSoldWithinOneYearMember2021-12-310000310158mrk:InventoriesProducedinPreparationforProductLaunchesMember2022-12-310000310158mrk:InventoriesProducedinPreparationforProductLaunchesMember2021-12-310000310158mrk:PharmaceuticalsegmentMember2020-12-310000310158mrk:AnimalHealthsegmentMember2020-12-310000310158mrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158mrk:AnimalHealthsegmentMember2021-01-012021-12-310000310158mrk:PharmaceuticalsegmentMember2021-12-310000310158mrk:AnimalHealthsegmentMember2021-12-310000310158mrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158mrk:AnimalHealthsegmentMember2022-01-012022-12-310000310158mrk:PharmaceuticalsegmentMember2022-12-310000310158mrk:AnimalHealthsegmentMember2022-12-310000310158us-gaap:DevelopedTechnologyRightsMember2022-12-310000310158us-gaap:DevelopedTechnologyRightsMember2021-12-310000310158us-gaap:InProcessResearchAndDevelopmentMember2022-12-310000310158us-gaap:InProcessResearchAndDevelopmentMember2021-12-310000310158us-gaap:TradeNamesMember2022-12-310000310158us-gaap:TradeNamesMember2021-12-310000310158us-gaap:LicenseMember2022-12-310000310158us-gaap:LicenseMember2021-12-310000310158mrk:ReblozylMemberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:ZerbaxaMemberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:SivextroMemberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:GardasilGardasil9Memberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:BridionMemberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:AnimalHealthMember2022-12-310000310158mrk:AnimalHealthMemberus-gaap:DevelopedTechnologyRightsMember2022-12-310000310158mrk:AnimalHealthMemberus-gaap:TradeNamesMember2022-12-310000310158mrk:SotaterceptMemberus-gaap:InProcessResearchAndDevelopmentMember2022-12-310000310158mrk:GefapixantMemberus-gaap:InProcessResearchAndDevelopmentMember2022-12-310000310158mrk:NemtabrutinibMemberus-gaap:InProcessResearchAndDevelopmentMember2022-12-310000310158mrk:ZerbaxaMember2020-01-012020-12-310000310158mrk:NemtabrutinibMemberus-gaap:InProcessResearchAndDevelopmentMember2022-01-012022-12-310000310158mrk:NemtabrutinibMemberus-gaap:InProcessResearchAndDevelopmentMember2022-07-012022-09-300000310158mrk:NemtabrutinibMemberus-gaap:InProcessResearchAndDevelopmentMember2022-12-012022-12-310000310158mrk:DerazantinibMemberus-gaap:LicenseMember2022-01-012022-12-310000310158mrk:NemtabrutinibMemberus-gaap:InProcessResearchAndDevelopmentMember2021-01-012021-12-310000310158mrk:NemtabrutinibMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputDiscountRateMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2021-12-310000310158mrk:NotesSubjectToRepaymentAtOptionOfHolderMember2022-12-310000310158mrk:NotesSubjectToRepaymentAtOptionOfHolderMember2021-12-310000310158us-gaap:CommercialPaperMember2022-12-310000310158us-gaap:CommercialPaperMember2021-12-310000310158mrk:A2.75NotesDue2025Member2022-12-310000310158mrk:A2.75NotesDue2025Member2021-12-310000310158mrk:A215NotesDue2031Member2022-12-310000310158mrk:A215NotesDue2031Member2021-12-310000310158mrk:A275NotesDue2051Member2022-12-310000310158mrk:A275NotesDue2051Member2021-12-310000310158mrk:A3.70NotesDue2045Member2022-12-310000310158mrk:A3.70NotesDue2045Member2021-12-310000310158mrk:A3.40NotesDue2029Member2022-12-310000310158mrk:A3.40NotesDue2029Member2021-12-310000310158mrk:A170NotesDue2027Member2022-12-310000310158mrk:A170NotesDue2027Member2021-12-310000310158mrk:A290NotesDue2061Member2022-12-310000310158mrk:A290NotesDue2061Member2021-12-310000310158mrk:A4.00NotesDue2049Member2022-12-310000310158mrk:A4.00NotesDue2049Member2021-12-310000310158mrk:A415NotesDue2043Member2022-12-310000310158mrk:A415NotesDue2043Member2021-12-310000310158mrk:A145NotesDue2030Member2022-12-310000310158mrk:A145NotesDue2030Member2021-12-310000310158mrk:A245NotesDue2050Member2022-12-310000310158mrk:A245NotesDue2050Member2021-12-310000310158mrk:A1.875EuroNotesDue2026Member2022-12-310000310158mrk:A1.875EuroNotesDue2026Member2021-12-310000310158mrk:A075NotesDue2026Member2022-12-310000310158mrk:A075NotesDue2026Member2021-12-310000310158mrk:A190NotesDue2028Member2022-12-310000310158mrk:A190NotesDue2028Member2021-12-310000310158mrk:A3.90NotesDue2039Member2022-12-310000310158mrk:A3.90NotesDue2039Member2021-12-310000310158mrk:A235NotesDue2040Member2022-12-310000310158mrk:A235NotesDue2040Member2021-12-310000310158mrk:A2.90NotesDue2024Member2022-12-310000310158mrk:A2.90NotesDue2024Member2021-12-310000310158mrk:SixPointFiveZeroPercentageNotesDueOnTwoThousandAndThirtyThreeMember2022-12-310000310158mrk:SixPointFiveZeroPercentageNotesDueOnTwoThousandAndThirtyThreeMember2021-12-310000310158mrk:A0.50eurodenominatednotesdue2024Member2022-12-310000310158mrk:A0.50eurodenominatednotesdue2024Member2021-12-310000310158mrk:A1.375eurodenominatednotesdue2036Member2022-12-310000310158mrk:A1.375eurodenominatednotesdue2036Member2021-12-310000310158mrk:A2.5EuroNotesDue2034Member2022-12-310000310158mrk:A2.5EuroNotesDue2034Member2021-12-310000310158mrk:ThreePointSixZeroPercentageNotesDueOnTwoThousandAndFortyTwoMember2022-12-310000310158mrk:ThreePointSixZeroPercentageNotesDueOnTwoThousandAndFortyTwoMember2021-12-310000310158mrk:SixPointFiveFivePercentageNotesDueOnTwoThousandAndThirtySevenMember2022-12-310000310158mrk:SixPointFiveFivePercentageNotesDueOnTwoThousandAndThirtySevenMember2021-12-310000310158mrk:FivePointSevenFivePercentageNotesDueOnTwoThousandAndThirtySixMember2022-12-310000310158mrk:FivePointSevenFivePercentageNotesDueOnTwoThousandAndThirtySixMember2021-12-310000310158mrk:FivePointNineFivePercentageDebenturesDueOnTwoThousandAndTwentyEightMember2022-12-310000310158mrk:FivePointNineFivePercentageDebenturesDueOnTwoThousandAndTwentyEightMember2021-12-310000310158mrk:FivePointEightFivePercentageNotesDueOnTwoThousandAndThirtyNineMember2022-12-310000310158mrk:FivePointEightFivePercentageNotesDueOnTwoThousandAndThirtyNineMember2021-12-310000310158mrk:SixPointFourPercentageDebenturesDueOnTwoThousandAndTwentyEightMember2022-12-310000310158mrk:SixPointFourPercentageDebenturesDueOnTwoThousandAndTwentyEightMember2021-12-310000310158mrk:A63DebenturesDue2026Member2022-12-310000310158mrk:A63DebenturesDue2026Member2021-12-310000310158mrk:A280NotesDue2023Member2022-12-310000310158mrk:A280NotesDue2023Member2021-12-310000310158mrk:OtherLongTermDebtMember2022-12-310000310158mrk:OtherLongTermDebtMember2021-12-310000310158mrk:OtherVariableRateDebtMember2022-12-310000310158mrk:OtherVariableRateDebtMember2021-12-310000310158us-gaap:BuildingMember2022-12-310000310158us-gaap:VehiclesMember2022-12-310000310158country:USmrk:GardasilGardasil9Member2022-12-31mrk:case0000310158mrk:GardasilGardasil9Memberus-gaap:NonUsMember2022-12-310000310158mrk:GardasilGardasil9Membercountry:CO2022-12-310000310158mrk:ZetiaantitrustlitigationMember2020-08-31mrk:claim0000310158mrk:ZetiaantitrustlitigationMemberus-gaap:PendingLitigationMember2022-06-302022-06-300000310158mrk:ZetiaantitrustlitigationMember2022-01-012022-12-310000310158mrk:CommercialandOtherLitigationMember2022-01-012022-12-31mrk:Plaintiff0000310158mrk:CommercialandOtherLitigationMember2022-12-310000310158mrk:BridionMemberus-gaap:PendingLitigationMemberus-gaap:PatentsMember2022-12-192022-12-190000310158mrk:BridionMemberus-gaap:PatentsMember2022-01-012022-12-310000310158mrk:BridionMemberus-gaap:PendingLitigationMemberus-gaap:PatentsMember2022-12-310000310158mrk:PatentlitigationMember2022-01-012022-12-310000310158mrk:LegalDefenseCostsMember2021-12-310000310158mrk:LegalDefenseCostsMember2022-12-310000310158us-gaap:CommonStockMember2022-01-012022-12-310000310158us-gaap:CommonStockMember2021-01-012021-12-310000310158us-gaap:CommonStockMember2020-01-012020-12-310000310158us-gaap:RestrictedStockUnitsRSUMember2021-12-310000310158us-gaap:PerformanceSharesMember2021-12-310000310158us-gaap:RestrictedStockUnitsRSUMember2022-01-012022-12-310000310158us-gaap:PerformanceSharesMember2022-01-012022-12-310000310158us-gaap:RestrictedStockUnitsRSUMember2022-12-310000310158us-gaap:PerformanceSharesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2022-01-012022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2021-01-012021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2020-01-012020-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2020-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2020-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMember2022-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USmrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanCashAndCashEquivalentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:CorporateObligationsInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:CorporateObligationsInvestmentFundsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:CorporateObligationsInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:CorporateObligationsInvestmentFundsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:FixedIncomeObligationsInvestmentFundsMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:InsuranceContractsOtherInvestmentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:InsuranceContractsOtherInvestmentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignPlanMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:InsuranceContractsOtherInvestmentsMember2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:InsuranceContractsOtherInvestmentsMember2020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:InsuranceContractsOtherInvestmentsMember2022-01-012022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2022-01-012022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:InsuranceContractsOtherInvestmentsMember2021-01-012021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherInvestmentsMember2021-01-012021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Membermrk:InsuranceContractsOtherInvestmentsMember2022-12-310000310158country:USus-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Member2022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2020-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2020-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2020-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2020-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2022-01-012022-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-01-012022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2022-01-012022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-01-012022-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMembermrk:InsuranceContractsOtherInvestmentsMember2021-01-012021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-01-012021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMember2021-01-012021-12-310000310158us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2021-01-012021-12-310000310158us-gaap:PensionPlansDefinedBenefitMembermrk:RealEstateInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ForeignPlanMember2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158us-gaap:CashAndCashEquivalentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:DevelopedMarketsEquitiesInvestmentFundsMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:EmergingMarketsEquitiesInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanRealEstateMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsInvestmentFundsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Membermrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:DevelopedMarketsEquitySecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158mrk:GovernmentAndAgencyObligationsFixedIncomeSecuritiesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:CorporateObligationsFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembermrk:MortgageAndAssetBackedSecuritiesFixedIncomeSecuritiesMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2022-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2022-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000310158country:USus-gaap:DefinedBenefitPlanEquitySecuritiesUsMembersrt:MinimumMember2022-12-310000310158country:USus-gaap:DefinedBenefitPlanEquitySecuritiesUsMembersrt:MaximumMember2022-12-310000310158country:USus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMembersrt:MinimumMember2022-12-310000310158country:USsrt:MaximumMemberus-gaap:DefinedBenefitPlanEquitySecuritiesNonUsMember2022-12-310000310158country:USus-gaap:FixedIncomeInvestmentsMembersrt:MinimumMember2022-12-310000310158country:USsrt:MaximumMemberus-gaap:FixedIncomeInvestmentsMember2022-12-310000310158country:USmrk:DefinedBenefitPlanCashandOtherInvestmentsMembersrt:MaximumMember2022-12-310000310158country:US2022-12-310000310158country:US2022-01-012022-12-310000310158country:US2021-01-012021-12-310000310158country:US2020-01-012020-12-310000310158country:US2021-12-310000310158country:US2020-12-310000310158country:USsrt:ScenarioForecastMember2023-01-012023-12-310000310158srt:ScenarioForecastMemberus-gaap:SubsequentEventMember2023-01-012023-03-310000310158mrk:IncomeTaxesPayableMember2022-12-310000310158us-gaap:OtherNoncurrentLiabilitiesMember2022-12-310000310158us-gaap:OtherAssetsMember2022-12-310000310158us-gaap:OtherAssetsMember2021-12-310000310158us-gaap:ForeignCountryMember2022-12-310000310158us-gaap:DomesticCountryMember2022-12-310000310158us-gaap:DomesticCountryMember2022-01-012022-12-310000310158us-gaap:DomesticCountryMember2021-01-012021-12-310000310158us-gaap:DomesticCountryMember2020-01-012020-12-310000310158us-gaap:ForeignCountryMember2022-01-012022-12-310000310158us-gaap:ForeignCountryMember2021-01-012021-12-310000310158us-gaap:ForeignCountryMember2020-01-012020-12-310000310158us-gaap:InternalRevenueServiceIRSMemberus-gaap:DomesticCountryMember2022-01-012022-12-310000310158us-gaap:InternalRevenueServiceIRSMemberus-gaap:SegmentContinuingOperationsMemberus-gaap:DomesticCountryMember2022-01-012022-12-310000310158us-gaap:SegmentDiscontinuedOperationsMemberus-gaap:InternalRevenueServiceIRSMemberus-gaap:DomesticCountryMember2022-01-012022-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2019-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-01-012020-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-01-012022-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-01-012022-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-12-310000310158us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-12-310000310158mrk:PensionPlanNetLossMember2022-12-310000310158mrk:PensionPlanNetLossMember2021-12-310000310158mrk:OtherPostretirementBenefitPlanNetLossMember2022-12-310000310158mrk:OtherPostretirementBenefitPlanNetLossMember2021-12-310000310158mrk:PensionPlanPriorServiceCostMember2022-12-310000310158mrk:PensionPlanPriorServiceCostMember2021-12-310000310158mrk:OtherPostretirementBenefitPlanPriorServiceCostMember2022-12-310000310158mrk:OtherPostretirementBenefitPlanPriorServiceCostMember2021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:KeytrudaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LenvimaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:LenvimaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LenvimaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LenvimaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:LenvimaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LenvimaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LenvimaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:LenvimaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LenvimaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ReblozylMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ReblozylMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ReblozylMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ReblozylMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ReblozylMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ReblozylMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ReblozylMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ProQuadMMRIIVarivaxMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ProQuadMMRIIVarivaxMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:ProQuadMMRIIVarivaxMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:ProQuadMMRIIVarivaxMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:RotateqMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:RotateqMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:RotateqMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:RotateqMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:Pneumovax23Membermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:VaqtaMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:VaqtaMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:VaqtaMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:VaqtaMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BridionMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BridionMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BridionMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BridionMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrevymisMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrevymisMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrevymisMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrevymisMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:DificidMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:DificidMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:DificidMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:DificidMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PrimaxinMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembercountry:USmrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembercountry:USmrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembercountry:USmrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:NoxafilMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:InvanzMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:InvanzMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:InvanzMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:InvanzMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:CancidasMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:CancidasMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:CancidasMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:CancidasMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:CancidasMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:CancidasMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:CancidasMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:CancidasMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:CancidasMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:ZerbaxaMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USmrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USmrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USmrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AllianceRevenueAdempasVerquvoMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AdempasMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AdempasMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AdempasMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AdempasMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LagevrioMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LagevrioMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:LagevrioMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:LagevrioMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:IsentressIsentressHDMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BelsomraMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:BelsomraMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BelsomraMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BelsomraMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:BelsomraMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BelsomraMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:BelsomraMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:BelsomraMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:BelsomraMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:SimponiMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:SimponiMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:SimponiMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:SimponiMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:SimponiMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:SimponiMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembercountry:USmrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembercountry:USmrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembercountry:USmrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:RemicadeMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:JanuviaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:JanuviaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:JanuviaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:JanuviaMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:JanumetMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:JanumetMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:JanumetMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:JanumetMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:PharmaceuticalsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMembermrk:LivestockMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMembermrk:LivestockMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMembermrk:LivestockMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:LivestockMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembercountry:USmrk:AnimalHealthsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembercountry:USmrk:AnimalHealthsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembercountry:USmrk:AnimalHealthsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USmrk:AnimalHealthsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:AnimalHealthsegmentMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:USus-gaap:AllOtherSegmentsMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMemberus-gaap:AllOtherSegmentsMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:USus-gaap:AllOtherSegmentsMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMemberus-gaap:AllOtherSegmentsMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:USus-gaap:AllOtherSegmentsMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMemberus-gaap:AllOtherSegmentsMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembercountry:US2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMember2022-01-012022-12-310000310158us-gaap:OperatingSegmentsMembercountry:US2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMember2021-01-012021-12-310000310158us-gaap:OperatingSegmentsMembercountry:US2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:OperatingSegmentsMember2020-01-012020-12-310000310158country:USus-gaap:CorporateNonSegmentMember2022-01-012022-12-310000310158us-gaap:CorporateNonSegmentMembermrk:InternationalMember2022-01-012022-12-310000310158us-gaap:CorporateNonSegmentMember2022-01-012022-12-310000310158country:USus-gaap:CorporateNonSegmentMember2021-01-012021-12-310000310158us-gaap:CorporateNonSegmentMembermrk:InternationalMember2021-01-012021-12-310000310158us-gaap:CorporateNonSegmentMember2021-01-012021-12-310000310158country:USus-gaap:CorporateNonSegmentMember2020-01-012020-12-310000310158us-gaap:CorporateNonSegmentMembermrk:InternationalMember2020-01-012020-12-310000310158us-gaap:CorporateNonSegmentMember2020-01-012020-12-310000310158country:US2022-01-012022-12-310000310158mrk:InternationalMember2022-01-012022-12-310000310158country:US2021-01-012021-12-310000310158mrk:InternationalMember2021-01-012021-12-310000310158country:US2020-01-012020-12-310000310158mrk:InternationalMember2020-01-012020-12-310000310158us-gaap:EMEAMember2022-01-012022-12-310000310158us-gaap:EMEAMember2021-01-012021-12-310000310158us-gaap:EMEAMember2020-01-012020-12-310000310158country:CN2022-01-012022-12-310000310158country:CN2021-01-012021-12-310000310158country:CN2020-01-012020-12-310000310158country:JP2022-01-012022-12-310000310158country:JP2021-01-012021-12-310000310158country:JP2020-01-012020-12-310000310158srt:AsiaPacificMember2022-01-012022-12-310000310158srt:AsiaPacificMember2021-01-012021-12-310000310158srt:AsiaPacificMember2020-01-012020-12-310000310158srt:LatinAmericaMember2022-01-012022-12-310000310158srt:LatinAmericaMember2021-01-012021-12-310000310158srt:LatinAmericaMember2020-01-012020-12-310000310158mrk:OtherCountriesMember2022-01-012022-12-310000310158mrk:OtherCountriesMember2021-01-012021-12-310000310158mrk:OtherCountriesMember2020-01-012020-12-310000310158us-gaap:MaterialReconcilingItemsMember2022-01-012022-12-310000310158us-gaap:MaterialReconcilingItemsMember2021-01-012021-12-310000310158us-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310000310158country:US2022-12-310000310158country:US2021-12-310000310158country:US2020-12-310000310158us-gaap:EMEAMember2022-12-310000310158us-gaap:EMEAMember2021-12-310000310158us-gaap:EMEAMember2020-12-310000310158srt:AsiaPacificMember2022-12-310000310158srt:AsiaPacificMember2021-12-310000310158srt:AsiaPacificMember2020-12-310000310158srt:LatinAmericaMember2022-12-310000310158srt:LatinAmericaMember2021-12-310000310158srt:LatinAmericaMember2020-12-310000310158country:CN2022-12-310000310158country:CN2021-12-310000310158country:CN2020-12-310000310158country:JP2022-12-310000310158country:JP2021-12-310000310158country:JP2020-12-310000310158mrk:OtherCountriesMember2022-12-310000310158mrk:OtherCountriesMember2021-12-310000310158mrk:OtherCountriesMember2020-12-31