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Financial Instruments, Derivatives and Fair Value Measures - Contracts (Details) $ in Millions, ¥ in Billions			1 Months Ended			12 Months Ended
	Nov. 21, 2019 USD ($)	Nov. 21, 2019 JPY (¥)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 JPY (¥)	Oct. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 28, 2018
Derivative instruments, notional amount and fair value
Fair Value - Liabilities						$ 1,075	$ 635
Proceeds from issuance of long-term debt						$ 1,281	$ 1,842	$ 4,009
Yen-denominated long-term debt
Derivative instruments, notional amount and fair value
Term of long term loan designated as hedge of the net investment in certain foreign subsidiaries			5 years	5 years
Proceeds from issuance of long-term debt	$ 550	¥ 59.8	$ 550	¥ 59.8
3.40% Notes, due 2023
Derivative instruments, notional amount and fair value
Interest rate percentage					3.40%	3.40%	3.40%		3.40%
3.75% Notes, due 2026
Derivative instruments, notional amount and fair value
Interest rate percentage					3.75%	3.75%	3.75%		3.75%
Interest rate swap to 3.40% and 3.75% notes
Derivative instruments, notional amount and fair value
Unwound interest rate swaps					$ 1,100
Payments to unwinding of derivative instruments					$ 90
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Gross notional amount						$ 8,100	$ 6,800
Minimum length of time over which accumulated gains and losses will be recognized in Cost of products sold						12 months
Maximum length of time over which accumulated gains and losses will be recognized in Cost of products sold						18 months
Designated as hedging instrument \| Interest rate swaps \| Fair value hedges
Derivative instruments, notional amount and fair value
Gross notional amount						$ 2,900	2,900
Designated as hedging instrument \| Debt \| Net investment hedges
Derivative instruments, notional amount and fair value
Gain (loss) Recognized in Other Comprehensive Income (loss)						(31)	4
Designated as hedging instrument \| Debt \| Long-term Debt \| Net investment hedges
Derivative instruments, notional amount and fair value
Fair Value - Liabilities						577	546
Not designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Gross notional amount						$ 11,000	$ 9,100