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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
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]        
ROW Expense $ 18 $ 13 $ 33 $ 32