CONDENSED STATEMENTS OF CONSOLIDATED INCOME (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Utility revenues		$ 1,555	$ 1,341	$ 3,716	$ 3,235
Non-utility revenues		1,243	845	2,613	2,106
Total		2,798	2,186	6,329	5,341
Expenses:
Utility natural gas, fuel and purchased power		264	188	999	825
Non-utility cost of revenues, including natural gas	[1]	910	790	2,161	2,063
Operation and maintenance		884	578	1,745	1,147
Depreciation and amortization		340	342	653	656
Taxes other than income taxes		113	101	239	212
Total		2,511	1,999	5,797	4,903
Operating Income		287	187	532	438
Other Income (Expense):
Gain on marketable securities		64	22	147	23
Loss on indexed debt securities		(68)	(254)	(154)	(272)
Interest and other finance charges		(134)	(91)	(255)	(169)
Interest on Securitization Bonds		(10)	(14)	(22)	(30)
Equity in earnings of unconsolidated affiliates, net		74	58	136	127
Other income (expense), net		11	4	31	7
Total		(63)	(275)	(117)	(314)
Income (Loss) Before Income Taxes		224	(88)	415	124
Income tax expense (benefit)		29	(13)	51	34
Net Income (Loss)		195	(75)	364	90
Preferred stock dividend requirement		30	0	59	0
Income (Loss) Available to Common Shareholders		$ 165	$ (75)	$ 305	$ 90
Basic Earnings (Loss) Per Common Share		$ 0.33	$ (0.17)	$ 0.61	$ 0.21
Diluted Earnings (Loss) Per Common Share		$ 0.33	$ (0.17)	$ 0.61	$ 0.21
Weighted Average Common Shares Outstanding, Basic		502,200,000	431,523,000	501,862,000	431,378,000
Weighted Average Common Shares Outstanding, Diluted		504,831,000	431,523,000	504,493,000	434,407,000
Houston Electric [Member]
Revenues:
Total		$ 765	$ 854	$ 1,451	$ 1,609
Expenses:
Operation and maintenance		359	351	727	693
Depreciation and amortization		176	262	351	495
Taxes other than income taxes		61	60	123	121
Total		596	673	1,201	1,309
Operating Income		169	181	250	300
Other Income (Expense):
Interest and other finance charges		(42)	(36)	(82)	(69)
Interest on Securitization Bonds		(10)	(14)	(22)	(30)
Other income (expense), net		6	(3)	10	(6)
Total		(46)	(53)	(94)	(105)
Income (Loss) Before Income Taxes		123	128	156	195
Income tax expense (benefit)		23	27	29	42
Net Income (Loss)		100	101	127	153
CERC Corp [Member]
Revenues:
Utility revenues		503	487	1,688	1,630
Non-utility revenues		839	841	2,022	2,098
Total		1,342	1,328	3,710	3,728
Expenses:
Utility natural gas, fuel and purchased power		190	188	815	825
Non-utility cost of revenues, including natural gas	[1]	769	790	1,940	2,063
Operation and maintenance		211	217	461	455
Depreciation and amortization		76	72	153	145
Taxes other than income taxes		38	39	87	87
Total		1,284	1,306	3,456	3,575
Operating Income		58	22	254	153
Other Income (Expense):
Interest and other finance charges		(30)	(33)	(59)	(62)
Other income (expense), net		0	(1)	(3)	(5)
Total		(30)	(34)	(62)	(67)
Income (Loss) Before Income Taxes		28	(12)	192	86
Income tax expense (benefit)		0	(4)	26	16
Income (Loss) From Continuing Operations		28	(8)	166	70
Income from discontinued operations (net of tax of $-0-, $14, $-0- and $31, respectively)		0	44	0	96
Net Income (Loss)		$ 28	$ 36	$ 166	$ 166

[1] Income statement impact associated with cash flow hedge activity is related to gains and losses reclassified from Accumulated other comprehensive income into income. Amounts are immaterial for each Registrant in the three and six months ended June 30, 2019 and 2018, respectively.