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Basis of Presentation and Significant Accounting Policies - Foreign Currency Translation and Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total foreign currency loss (gain) $ 3 $ 58 $ (40)
Unrealized foreign currency option and forward contracts (gains) losses      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total foreign currency loss (gain) (20) 49 (40)
Realized foreign currency option and forward contracts losses (gains)      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total foreign currency loss (gain) 16 15 (3)
Foreign currency transaction and remeasurement losses (gains)      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Total foreign currency loss (gain) $ 7 $ (6) $ 3