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Face (par) amount of debt instrument at time of issuance.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Financial Instruments and Fair Value Measures - Financial Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) company	Dec. 31, 2018 EUR (€) company	Dec. 31, 2017 USD ($)
Derivative instruments, notional amount and fair value
Number of outstanding derivative instruments containing credit risk contingent features \| company	0	0
Foreign currency contracts in asset position	$ 132		$ 23
Foreign currency contracts in liability position	492		550
Designated as hedging instrument \| Net Investment Hedges \| Senior notes
Derivative instruments, notional amount and fair value
Principal amount of unsecured senior notes \| €		€ 3,600,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Foreign currency contracts in asset position	113		1
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash Flow Hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	$ 1,400		2,200
Duration of forward 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 \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Foreign currency contracts in liability position	$ 0		120
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net Investment Hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments \| €		€ 3,500,000,000
Designated as hedging instrument \| Interest rate swap \| Fair Value Hedging
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	10,800		11,800
Designated as hedging instrument \| Interest rate swap \| Fair Value Hedging \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Foreign currency contracts in asset position	0		0
Designated as hedging instrument \| Interest rate swap \| Fair Value Hedging \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Foreign currency contracts in liability position	0		8
Designated as hedging instrument \| Interest rate swap \| Fair Value Hedging \| Other assets
Derivative instruments, notional amount and fair value
Foreign currency contracts in asset position	0		0
Designated as hedging instrument \| Interest rate swap \| Fair Value Hedging \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Foreign currency contracts in liability position	466		393
Not designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	8,600		7,700
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Foreign currency contracts in asset position	19		22
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Foreign currency contracts in liability position	$ 26		$ 29