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Financial Instruments (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount						$ 9,000	$ 11,600
Gain (loss) recorded in Accumulated other comprehensive loss	$ (175)	$ 117	$ (113)	$ (98)
(Gain) loss reclassified from Accumulated other comprehensive loss into Product Sales (effective portion)	8	37	(26)	93
Foreign Currency Cash Flow Hedge Loss to be Reclassified During Next 12 Months						3
(Gain) Loss recognized in Other income, net	$ (1)	$ (4)	$ (9)	$ (33)
Notes 2.150% Due 2030 [Member]
Derivatives, Fair Value [Line Items]
Long-term debt, euro-denominated \| €					€ 500
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as hedging instruments, Asset Derivatives						91	197
Derivatives not designated as hedging instruments, Asset Derivatives						12	44
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as hedging instruments, Liability Derivatives						111	66
Derivatives not designated as hedging instruments, Liability Derivatives						$ 22	$ 32