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Long-Term Debt (Aggregate Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 1,000  
2021 1,500  
2022 2,900  
2023 1,752  
2024 2,400  
Thereafter 18,723  
Long-term debt before debt issuance costs and debt discount 28,275  
Less: 154  
Less: debt discounts 79  
Long-term debt $ 28,042 $ 13,042