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Contingencies (Details) $ in Millions			1 Months Ended			6 Months Ended
	Mar. 15, 2024	Apr. 13, 2023 patent	Feb. 29, 2024 patent	Jun. 30, 2023	Feb. 28, 2023 patent	Jun. 30, 2024 USD ($) company case	Dec. 31, 2023 USD ($)
Legal Defense Costs
Loss Contingencies [Line Items]
Legal defense costs reserve | $						$ 215	$ 210
Gardasil/Gardasil 9 | Non-US | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims | case						15
Bridion | Patents
Loss Contingencies [Line Items]
Loss contingency, claims settled						5
Bridion | Pending Litigation | Patents
Loss Contingencies [Line Items]
Loss contingency, pending claims						2
Postponement period resulting from litigation	30 months
Bridion | Settled Litigation | Patents
Loss Contingencies [Line Items]
Patent extension, term				5 years
Keytruda | Pending Litigation | Patents
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed | patent		9
Lynparza | Pending Litigation | Patents
Loss Contingencies [Line Items]
Loss contingency, number of patents allegedly infringed | patent			1		1
Januvia/Janumet
Loss Contingencies [Line Items]
Loss contingency, claims settled						26

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