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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 14  
2022 10  
2023 6  
2024 1  
2025 1  
Thereafter 2  
Net carrying amount $ 34 $ 74