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Accounting for Derivative Instruments and Hedging Activities Derivative instruments effect on the Company's condensed consolidated balance sheets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Accumulated other comprehensive loss $ (25) $ (41)
Accrued interest [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of interest rate derivatives not designated as hedges 4 8
Other long-term liabilities [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of interest rate derivatives not designated as hedges 13 22
Accumulated other comprehensive loss [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Accumulated other comprehensive loss $ (25) $ (41)