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Goodwill and Intangible Assets - Expected Future Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fiscal years:    
Remaining 2020 $ 108  
2021 398  
2022 336  
2023 99  
2024 97  
Thereafter 108  
Net Carrying Amount $ 1,146 $ 778