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Risk Management (Summary of Derivative Instruments and the Effect on the Condensed Consolidated Statements Of Operations) (Details) - Not Designated As Hedging Instruments - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives not designated as hedging instruments $ 7 $ (4) $ 8
Interest rate contracts | Other income (expense)      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives not designated as hedging instruments 1 1 2
Foreign exchange contracts | Other income (expense)      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives not designated as hedging instruments $ 6 $ (5) $ 6