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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Schedule of Right of Way Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]        
Contractual Right of Way, Expense $ 5 $ 5 $ 17 $ 18