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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, 2018
USD ($)
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract]  
2019 $ 104
2020 95
2021 74
2022 58
2023 50
Thereafter 220
Total Future Rent Payments 601
Future Rental Income (111)
Net Future Rental Payments $ 490