CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ (75)	$ 135	$ 90	$ 327
Other comprehensive income:
Adjustment to pension and other postretirement plans (net of tax of $-0-, $1, $1 and $2)	2	1	3	2
Net deferred gain (loss) from cash flow hedges (net of tax of $-0-, $-0-, $1 and $-0-)	(1)	0	3	(1)
Total	1	1	6	1
Comprehensive income (loss)	(74)	136	96	328
Houston Electric [Member]
Net income (loss)	101	75	153	93
Other comprehensive income:
Net deferred gain (loss) from cash flow hedges (net of tax of $-0-, $-0-, $1 and $-0-)	0	0	4	(1)
Total	0	0	4	(1)
Comprehensive income (loss)	101	75	157	92
CERC Corp [Member]
Net income (loss)	36	54	166	201
Other comprehensive income:
Comprehensive income (loss)	$ 36	$ 54	$ 166	$ 201