CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (Parentheticals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Tax benefit (expense) on adjustment related to pension and postretirement plans	$ (1)	$ (1)	$ (2)	$ (2)
Tax expense (benefit) on net deferred gain (loss) from cash flow hedges	0	0	0	0
Tax expense (benefit) on reclassification of deferred (gain) loss from cash flow hedges realized in net income	0	0	0	0
Tax expense (benefit) on reclassification of net deferred losses from cash flow hedges	4	0	4	0
Tax benefit (expense) on Other comprehensive loss from unconsolidated affiliates	0	0	0	0
Houston Electric [Member]
Tax expense (benefit) on net deferred gain (loss) from cash flow hedges	0	$ 0	0	$ 0
Tax expense (benefit) on reclassification of net deferred losses from cash flow hedges	$ 4		$ 4