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Contingencies and Environmental Liabilities (Details) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2014 case	Dec. 31, 2021 USD ($) case claim Plaintiff	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Accrued liabilities for environmental matters | $		$ 40	$ 43
Term for paying off environmental liabilities		15 years
Aggregate possible expenditure on environmental matters in excess of amounts accrued | $		$ 40
Legal Defense Costs
Loss Contingencies [Line Items]
Legal defense costs reserve | $		$ 230	$ 235
Commercial Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims (in cases)		2
Loss contingency, number of plaintiffs | Plaintiff		2
Patent litigation
Loss Contingencies [Line Items]
Loss contingency, claims settled (in cases)		21
Fosamax
Loss Contingencies [Line Items]
Loss contingency, pending claims (in cases)		3,470
Fosamax | Federal Court
Loss Contingencies [Line Items]
Loss contingency, claims dismissed (in cases)	650
Loss contingency, claims on appeal (in cases)	515
Januvia
Loss Contingencies [Line Items]
Loss contingency, pending claims (in cases)		675
Januvia | Cases Company Agreed To Toll Statute Of Limitations
Loss Contingencies [Line Items]
Loss contingency, pending claims (in cases) | claim		50
Januvia | Other State Court
Loss Contingencies [Line Items]
Loss contingency, pending claims (in cases)		6

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