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Long-Term Debt (Aggregate Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2022 $ 1,105  
2023 1,639  
2024 1,121  
2025 1,603  
2026 1,569  
Thereafter 21,262  
Long-term debt before debt issuance costs and debt discount 28,299  
Less: debt issuance costs 163  
Less: debt discounts 92  
Long-term debt $ 28,044 $ 29,471