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Intangible Assets, Net - Schedule of Future Amortization (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Definite-lived intangible assets, future amortization expense disclosure    
2019 (remaining nine months) $ 149  
2020 74  
2021 12  
2022 7  
2023 2  
Thereafter 3  
Net carrying amount, definite-lived intangible assets $ 247 $ 302