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Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2021 $ 23  
2022 19  
2023 12  
2024 3  
2025 3  
Thereafter 21  
Net Carrying Amount $ 81 $ 77