Financial Instruments and Fair Value Measures (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Financial Instruments and Fair Value Measures
Number of outstanding derivative instruments containing credit risk contingent features | item	0
Derivative instruments, notional amount and fair value
Derivatives in asset position	$ 92	$ 211
Derivatives in liability position	23	243
Interest rate contracts | Fair value hedges | Other long-term liabilities
Derivative instruments, notional amount and fair value
Derivatives in asset position	62
Derivatives in liability position	6	180
Designated as hedging instrument | Interest rate contracts | Fair value hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	11,000	8,000
Designated as hedging instrument | Foreign currency forward exchange contracts | Prepaid expenses and other
Derivative instruments, notional amount and fair value
Derivatives in asset position	7	141
Designated as hedging instrument | Foreign currency forward exchange contracts | Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	$ 98	1,400
Approximate length of time over which accumulated gains and losses will be recognized in Cost of products sold	12 months
Not designated as hedging instrument | Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments	$ 6,200	6,800
Not designated as hedging instrument | Foreign currency forward exchange contracts | Prepaid expenses and other
Derivative instruments, notional amount and fair value
Derivatives in asset position	23	70
Not designated as hedging instrument | Foreign currency forward exchange contracts | Accounts payable and accrued liabilities.
Derivative instruments, notional amount and fair value
Derivatives in liability position	$ 17	$ 63