Derivatives and Hedging Instruments - Derivative Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 5	$ 19
Derivative Liabilities, Fair Value	1	2
Foreign Exchange Derivative [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(3)
Derivatives designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	4	18
Derivative Liabilities, Fair Value	0	1
Derivatives designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	166	251
Derivative Assets, Fair Value	4	18
Derivatives designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	15	56
Derivative Liabilities, Fair Value	0	1
Derivatives not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	1	1
Derivative Liabilities, Fair Value	1	1
Derivatives not designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	175	165
Derivative Assets, Fair Value	1	1
Derivatives not designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	174	218
Derivative Liabilities, Fair Value	$ 1	$ 1