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Goodwill and Intangible Assets - Expected Future Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fiscal years:    
2021 $ 294  
2022 337  
2023 99  
2024 98  
2025 82  
Thereafter 28  
Net Carrying Amount $ 938 $ 1,048