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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 ($)	Nov. 21, 2019 JPY (¥)	Oct. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 28, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative instruments, notional amount and fair value
Fair Value - Liabilities					$ 635	$ 195
Proceeds from issuance of long-term debt designated as a hedge of the net investment in a foreign subsidiary					$ 1,842	$ 4,009	$ 6,742
Yen-denominated short-term debt
Derivative instruments, notional amount and fair value
Repayment of short-term debt designated as a hedge of the net investment in a foreign subsidiary				$ 479			479
Yen-denominated long-term debt
Derivative instruments, notional amount and fair value
Proceeds from issuance of long-term debt designated as a hedge of the net investment in a foreign subsidiary	$ 550	¥ 59.8
Term of long term loan designated as hedge of the net investment in certain foreign subsidiaries	5 years	5 years
3.40% Note due in 2023 and the 3.75% Note due in 2026
Derivative instruments, notional amount and fair value
Unwound interest rate swaps								$ 1,100
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 2.00% and 2.55% notes
Derivative instruments, notional amount and fair value
Unwound interest rate swaps									$ 1,500
2.00% Notes, due 2020
Derivative instruments, notional amount and fair value
Interest rate percentage								2.00%	2.00%
2.55% Notes, due 2022
Derivative instruments, notional amount and fair value
Interest rate percentage					2.55%	2.55%			2.55%
4.125% Notes, due 2020
Derivative instruments, notional amount and fair value
Interest rate percentage								4.125%
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 \| Short-term borrowings \| Net investment hedges
Derivative instruments, notional amount and fair value
Fair Value - Liabilities										$ 454
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Gross notional amount					$ 6,800	$ 5,100
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
Gain (loss) Recognized in Other Comprehensive Income (loss)					$ 9	73	(226)
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)					4		$ (25)
Designated as hedging instrument \| Debt \| Long-term Debt \| Net investment hedges
Derivative instruments, notional amount and fair value
Fair Value - Liabilities					546
Not designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Gross notional amount					$ 9,100	$ 13,600