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Goodwill and Intangible Assets - Expected Future Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 45  
2021 18  
2022 2  
2023 2  
2024 0  
Net Carrying Amount $ 67 $ 92