CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 158	$ 169	$ 248	$ 496
Other comprehensive income (loss):
Adjustment to pension and other postretirement plans (net of tax of $1, $2, $2 and $4)	1	0	4	2
Net deferred gain (loss) from cash flow hedges (net of tax)	3	(2)	6	(3)
Total	4	(2)	10	(1)
Comprehensive income	162	167	258	495
Houston Electric [Member]
Net income	143	130	296	223
Other comprehensive income (loss):
Net deferred gain (loss) from cash flow hedges (net of tax)	3	0	7	(1)
Total	3	0	7	(1)
Comprehensive income	146	130	303	222
CERC Corp [Member]
Net income	9	38	175	239
Other comprehensive income (loss):
Net deferred gain (loss) from cash flow hedges (net of tax)	0	(1)	0	(1)
Comprehensive income	$ 9	$ 38	$ 175	$ 239