Condensed Statements of Consolidated Changes in Equity (Unaudited) - Houston Electric - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings	Houston Electric	Houston Electric Common Stock	Houston Electric Additional Paid-in-Capital	Houston Electric Retained Earnings
Balance, beginning of period (in shares) at Dec. 31, 2021		629,000,000				1,000
Balance, beginning of period at Dec. 31, 2021		$ 6	$ 8,529	$ 154		$ 0	$ 2,678	$ 944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							675
Other							1
Net income	$ 531			531	$ 61			61
Dividend to parent								(37)
Balance, end of period (in shares) at Mar. 31, 2022		629,000,000				1,000
Balance, end of period at Mar. 31, 2022	$ 9,951	$ 6	8,532	685	4,322	$ 0	3,354	968
Balance, beginning of period (in shares) at Dec. 31, 2022	629,535,631	630,000,000				1,000
Balance, beginning of period at Dec. 31, 2022	$ 10,042	$ 6	8,568	709	4,998	$ 0	3,860	1,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							650
Other							0
Net income	$ 325			325	108			108
Dividend to parent								(51)
Balance, end of period (in shares) at Mar. 31, 2023	631,018,976	631,000,000				1,000
Balance, end of period at Mar. 31, 2023	$ 10,356	$ 6	$ 8,558	$ 1,034	$ 5,705	$ 0	$ 4,510	$ 1,195