XML 66 R55.htm IDEA: XBRL DOCUMENT v3.20.2
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Schedule of Right of Way Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]        
Contractual Right of Way, Expense $ 10 $ 6 $ 19 $ 12