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Long-Term Debt (Aggregate Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 1,144  
2020 1,000  
2021 1,500  
2022 1,900  
2023 350  
Thereafter 7,259  
Long-term debt before debt issuance costs and debt discount 13,153  
Less: debt issuance costs 60  
Less: debt discounts 51  
Long-term debt $ 13,042 $ 13,894