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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, 2017
USD ($)
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract]  
2018 $ 113
2019 100
2020 96
2021 83
2022 71
Thereafter 606
Total Future Rent Payments 1,069
Future Rental Income (152)
Net Future Rental Payments $ 917