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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Prepaid expenses and other current assets $ 16 $ 10
Accounts payable and accrued liabilities 0 (17)
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Cash flow hedge gains (losses) recorded in accumulated OCI 34 28
Cash flow hedge gains (losses) recorded in accumulated OCI deferred gains (losses) 1 21
Foreign Currency Derivatives [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 64 77
Derivative Liability, Fair Value, Gross Liability 48 84
Derivative, Lower Remaining Maturity Range 3 months  
Derivative, Higher Remaining Maturity Range 18 months  
Qualifying Hedges [Member] | Foreign Currency Derivatives [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 46 64
Derivative Liability, Fair Value, Gross Liability 35 53
Economic Hedges [Member] | Foreign Currency Derivatives [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 18 13
Derivative Liability, Fair Value, Gross Liability $ 13 $ 31