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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 1,527  
2022 1,527  
2023 1,527  
2024 1,527  
2025 1,521  
Thereafter 8,607  
Total $ 16,236 $ 12,544