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Financial Instruments and Fair Value Measures - Financial Instruments (Details) £ in Millions, SFr in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) company	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€) company	Dec. 31, 2019 CHF (SFr) company	Dec. 31, 2019 GBP (£) company	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)
Derivative instruments, notional amount and fair value
Number of outstanding derivative instruments containing credit risk contingent features \| company	0			0	0	0
Fair value - Derivatives in asset position	$ 53	$ 132
Fair value - Derivatives in liability position	132	492
Senior notes \| September 2019 senior Euro notes
Derivative instruments, notional amount and fair value
Aggregate principal amount of senior Euro notes \| €								€ 1,400,000,000
Designated as hedging instrument \| Net investment hedges \| Senior notes
Derivative instruments, notional amount and fair value
Aggregate principal amount of senior Euro notes \| €				€ 3,600,000,000
Designated as hedging instrument \| Net investment hedges \| Senior notes \| September 2019 senior Euro notes
Derivative instruments, notional amount and fair value
Aggregate principal amount of senior Euro notes \| €				1,400,000,000
Designated as hedging instrument \| Net investment hedges \| Senior notes \| Senior Euro notes
Derivative instruments, notional amount and fair value
Aggregate principal amount of senior Euro notes \| €				1,400,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	(5)	175	$ (250)
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	$ 957	1,400
Duration of forward exchange contracts	18 months
Approximate length of time over which accumulated gains and losses will be recognized in cost of products sold	6 months
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	$ 3	113
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	14	0
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments				€ 971,000,000	SFr 62	£ 204
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	0	0
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	24	0
Designated as hedging instrument \| Treasury rate lock agreements
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	383	0	0
Designated as hedging instrument \| Treasury rate lock agreements \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments							$ 10,000
Designated as hedging instrument \| Interest rate swap contracts
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	4	0	$ 0
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	2,300
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Other assets
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	3	0
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	0	0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	10,800	10,800
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	0	0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	2	0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Other assets
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	28	0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	74	466
Not designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	7,100	8,600
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position	19	19
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position	$ 18	$ 26