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Debt, Credit Facilities, and Commitments and Contingencies - Summary of Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-term Debt, Fiscal Year Maturity [Abstract]    
2020 $ 3,750  
2021 6,300  
2022 7,850  
2023 2,250  
2024 5,375  
Thereafter 41,708  
Total obligations and commitments 67,233  
Fair value hedges, unamortized bond discounts, deferred financing costs and finance lease obligations (505)  
Total long-term debt and finance lease obligations $ 66,728 $ 36,611