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Other Long-Term Assets, Net - Schedule of Long-term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Long-Term Assets, Net      
Intangible assets $ 1,209 $ 1,265  
Other 144 60  
Other long-term assets, gross 1,353 1,325  
Accumulated amortization (437) (421)  
Other long-term assets, net 916 904  
Amortization expense for finite-lived intangible assets $ 66 $ 54 $ 44