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Other Long-Term Assets, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Long-Term Assets, Net      
Intangible assets $ 610 $ 644  
Fair value of derivative instruments 9 27  
Other 94 61  
Other long-term assets, gross 713 732  
Accumulated amortization (327) (301)  
Other long-term assets, net 386 431  
Amortization expense for finite-lived intangible assets $ 49 $ 57 $ 85