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Long-Term Debt (Aggregate Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 864  
2019 1,144  
2020 1,000  
2021 1,500  
2022 1,900  
Thereafter 7,609  
Long-term debt before debt issuance costs and debt discount 14,017  
Less: debt issuance costs 68  
Debt discounts 55  
Long-term debt $ 13,894 $ 13,881