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Debt - Annual Maturities of Total Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2022 $ 508  
2023 4,923  
2024 2,391  
2025 1,677  
2026 2,027  
Thereafter 9,836  
Total principal payments 21,362  
Unamortized discount and deferred financing costs (125) $ (155)
Total long-term debt $ 21,237