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Other Long-Term Assets, Net - Schedule of Long-term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Long-Term Assets, Net      
Intangible assets $ 1,265 $ 603  
Other 60 48  
Other long-term assets, gross 1,325 651  
Accumulated amortization (421) (361)  
Other long-term assets, net 904 290  
Amortization expense for finite-lived intangible assets $ 54 $ 44 $ 49