Derivative Instruments (Income Statement Location) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax			$ (6)	$ (4)
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (2)
Foreign Exchange Contract | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax			5	5
Foreign Exchange Contract | Cost of Sales | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	5	$ 3
Foreign Exchange Contract | Other Income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax			(11)	$ (9)
Foreign Exchange Contract | Other Income (expense) | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(7)	$ (3)
Senior Unsecured Notes 2.00% due 2016
Derivative Instruments, Gain (Loss) [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 750		$ 750