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Long-Term Debt-Maturity Schedule (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
Long-term debt, maturities, 2018 $ 8,548
Long-term debt, maturities, 2019 5,103
Long-term debt, maturities, 2020 6,994
Long-term debt, maturities, 2021 3,599
Long-term debt, maturities, 2022 1,647
Long-term debt, maturities, Thereafter 9,075
Total $ 34,966