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Long-Term Debt (Debt Maturities By Year) (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Long-Term Debt [Abstract]  
Principal Payments 2016 (remaining six months) $ 376
Principal Payments 2017 727
Principal Payments 2018 701
Principal Payments 2019 787
Principal Payments 2020 2,185
Principal Payments 2021 2,373
Principal Payments Thereafter $ 11,093