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Derivative Instruments and Hedging Activity - Fair Value of Derivative Instruments Included in Balance Sheets (Details) - Cash Flow Hedges [Member] - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, assets   $ 5
Fair value of derivative instruments, liabilities $ 1  
Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, assets   3
Fair value of derivative instruments, liabilities 6 3
Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, liabilities $ 11 $ 8