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Long-Term Debt (Debt Maturities By Year) (Details)
$ in Millions
Jun. 30, 2017
USD ($)
Long-Term Debt [Abstract]  
Principal Payments 2017 (remaining six months) $ 83
Principal Payments 2018 748
Principal Payments 2019 833
Principal Payments 2020 1,156
Principal Payments 2021 2,569
Principal Payments 2022 2,703
Principal Payments Thereafter $ 10,010