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Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2020 $ 25  
2021 21  
2022 13  
2023 3  
2024 3  
Thereafter 24  
Net Carrying Amount $ 89 $ 81