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, 2022		630,000,000				1,000
Balance, beginning of period at Dec. 31, 2022		$ 6	$ 8,568	$ 709		$ 0	$ 3,860	$ 1,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							650
Net income	$ 443			443	$ 266			266
Dividend to parent								(160)
Balance, end of period (in shares) at Jun. 30, 2023		631,000,000				1,000
Balance, end of period at Jun. 30, 2023	10,366	$ 6	8,570	1,032	5,754	$ 0	4,510	1,244
Balance, beginning of period (in shares) at Mar. 31, 2023		631,000,000				1,000
Balance, beginning of period at Mar. 31, 2023		$ 6	8,558	1,034		$ 0	4,510	1,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							0
Net income	118			118	158			158
Dividend to parent								(109)
Balance, end of period (in shares) at Jun. 30, 2023		631,000,000				1,000
Balance, end of period at Jun. 30, 2023	$ 10,366	$ 6	8,570	1,032	5,754	$ 0	4,510	1,244
Balance, beginning of period (in shares) at Dec. 31, 2023	631,225,829	631,000,000				1,000
Balance, beginning of period at Dec. 31, 2023	$ 9,667	$ 6	8,604	1,092	6,109	$ 0	4,745	1,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							230
Net income	$ 578			578	286			286
Dividend to parent								(155)
Balance, end of period (in shares) at Jun. 30, 2024	641,953,090	642,000,000				1,000
Balance, end of period at Jun. 30, 2024	$ 10,354	$ 6	8,836	1,542	6,470	$ 0	4,975	1,495
Balance, beginning of period (in shares) at Mar. 31, 2024		633,000,000				1,000
Balance, beginning of period at Mar. 31, 2024		$ 6	8,583	1,442		$ 0	4,975	1,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							0
Net income	$ 228			228	187			187
Dividend to parent								(119)
Balance, end of period (in shares) at Jun. 30, 2024	641,953,090	642,000,000				1,000
Balance, end of period at Jun. 30, 2024	$ 10,354	$ 6	$ 8,836	$ 1,542	$ 6,470	$ 0	$ 4,975	$ 1,495