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Long-Term Debt (Aggregate Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 1,500  
2022 2,900  
2023 1,877  
2024 2,400  
2025 1,666  
Thereafter 19,358  
Long-term debt before debt issuance costs and debt discount 29,701  
Less: debt issuance costs 151  
Less: debt discounts 79  
Long-term debt $ 29,471 $ 28,042