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Intangible Assets, Net - Future Amortization Schedule (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Definite-lived intangible assets, future amortization expense disclosure    
2021 $ 10  
2022 6  
2023 2  
2024 0  
2025 0  
Thereafter 0  
Net carrying amount, definite-lived intangible assets $ 18 $ 98