Derivatives and Hedging Instruments - Derivative Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 2	$ 1
Derivative Liabilities, Fair Value	7	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	5
Derivatives designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	2	0
Derivative Liabilities, Fair Value	6	1
Derivatives designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	61	104
Derivative Assets, Fair Value	2	0
Derivatives designated as hedging instrument [Member] | Foreign Exchange Derivative [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	137	142
Derivative Liabilities, Fair Value	6	1
Derivatives not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	0	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	170	101
Derivative Assets, Fair Value	0	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	199	292
Derivative Liabilities, Fair Value	$ 1	$ 1