Derivatives and Hedging Instruments - Derivative Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 5	$ 1
Derivative Liabilities, Fair Value	6	11
Interest Rate Swap Ending Notional	341
Derivatives designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	0
Derivative Liabilities, Fair Value	6	6
Derivatives not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	0	1
Derivative Liabilities, Fair Value	0	5
Interest Rate Swap [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	(2)
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0	0
Derivative Assets, Fair Value	0	0
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	4	4
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities and other liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	434	462
Derivative Liabilities, Fair Value	5	6
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other noncurrent liabilities [Member]
Derivatives, Fair Value [Line Items]
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
Foreign Exchange Derivative [Member] | Derivatives designated as hedging instrument [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	119
Derivative Assets, Fair Value	5
Foreign Exchange Derivative [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	34
Derivative Liabilities, Fair Value	1
Foreign Exchange Derivative [Member] | Derivatives not designated as hedging instrument [Member] | Other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	105	186
Derivative Assets, Fair Value	0	1
Foreign Exchange Derivative [Member] | Derivatives not designated as hedging instrument [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	217	330
Derivative Liabilities, Fair Value	$ 0	$ 5