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Debt, Credit Facilities, and Commitments and Contingencies - Summary of Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]    
2021 $ 8,422  
2022 12,428  
2023 4,215  
2024 7,426  
2025 8,771  
Thereafter 43,686  
Total obligations and commitments 84,948  
Fair value hedges, unamortized bond premiums and discounts, deferred financing costs and finance lease obligations 1,074  
Total long-term debt and finance lease obligations $ 86,022 $ 66,728