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Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
The remainder of 2020 $ 120  
2021 388  
2022 122  
2023 54  
2024 29  
Thereafter 31  
Net Carrying Amount $ 744 $ 894