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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Schedule of Future Minimum Rental Payments for Operating Leases) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract]  
2017 $ 82
2018 67
2019 55
2020 52
2021 53
Thereafter 219
Total Future Rent Payments 528
Future Rental Income (79)
Net Future Rental Payments $ 449