CONDENSED STATEMENTS OF CONSOLIDATED INCOME (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Revenues:
Utility revenues		$ 2,161	$ 1,894
Non-utility revenues		1,370	1,261
Total		3,531	3,155
Expenses:
Utility natural gas, fuel and purchased power		735	637
Non-utility cost of revenues, including natural gas	[1]	1,251	1,273
Operation and maintenance		861	569
Depreciation and amortization		313	314
Taxes other than income taxes		126	111
Total		3,286	2,904
Operating Income		245	251
Other Income (Expense):
Gain on marketable securities		83	1
Loss on indexed debt securities		(86)	(18)
Interest and other finance charges		(121)	(78)
Interest on Securitization Bonds		(12)	(16)
Equity in earnings of unconsolidated affiliate, net		62	69
Other income (expense), net		20	3
Total		(54)	(39)
Income Before Income Taxes		191	212
Income tax expense		22	47
Net Income		169	165
Preferred stock dividend requirement		29	0
Income Available to Common Shareholders		$ 140	$ 165
Basic Earnings Per Common Share		$ 0.28	$ 0.38
Diluted Earnings Per Common Share		$ 0.28	$ 0.38
Weighted Average Common Shares Outstanding, Basic		501,521,000	431,231,000
Weighted Average Common Shares Outstanding, Diluted		503,944,000	434,008,000
Houston Electric [Member]
Revenues:
Total		$ 686	$ 755
Expenses:
Operation and maintenance		368	342
Depreciation and amortization		175	233
Taxes other than income taxes		62	61
Total		605	636
Operating Income		81	119
Other Income (Expense):
Interest and other finance charges		(40)	(33)
Interest on Securitization Bonds		(12)	(16)
Other income (expense), net		4	(3)
Total		(48)	(52)
Income Before Income Taxes		33	67
Income tax expense		6	15
Net Income		27	52
CERC Corp [Member]
Revenues:
Utility revenues		1,185	1,143
Non-utility revenues		1,183	1,257
Total		2,368	2,400
Expenses:
Utility natural gas, fuel and purchased power		625	637
Non-utility cost of revenues, including natural gas	[1]	1,171	1,273
Operation and maintenance		250	238
Depreciation and amortization		77	73
Taxes other than income taxes		49	48
Total		2,172	2,269
Operating Income		196	131
Other Income (Expense):
Interest and other finance charges		(29)	(29)
Other income (expense), net		(3)	(4)
Total		(32)	(33)
Income Before Income Taxes		164	98
Income tax expense		26	20
Income From Continuing Operations		138	78
Income from discontinued operations (net of tax of $0 and $17, respectively)		0	52
Net Income		$ 138	$ 130

[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 months ended March 31, 2019 and 2018, respectively.