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Derivative Instruments and Hedging Activities - Earnings Effect of Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Designated as hedging instrument [member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), effective portion, net [1] $ (10) $ 8 $ (18) $ (6)
Not designated as hedging instrument [member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on interest rate derivative instruments not designated as hedging instruments 0 0 0 0
Derivative instruments, gain (loss) recognized in income, ineffective portion and amount excluded from effectiveness testing, net [1] 0 $ 0 0 $ 0
Gain (loss) on foreign exchange forward contracts not designated as hedging instruments $ 6   $ 12  
[1] There were no amounts recognized in earnings related to hedge ineffectiveness or amounts excluded from hedge effectiveness testing during the three and nine months ended September 30, 2015 and 2014.