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Intangible Assets, Net - Future Amortization Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Definite-lived intangible assets, future amortization expense disclosure    
2019 $ 204  
2020 74  
2021 12  
2022 7  
2023 2  
Thereafter 3  
Net carrying amount, definite-lived intangible assets $ 302 $ 673