STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - HOUSTON ELECTRIC - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings (Accumulated Deficit)	Houston Electric	Houston Electric Common Stock	Houston Electric Additional Paid-in-Capital	Houston Electric Retained Earnings (Accumulated Deficit)
Balance, beginning of year (in shares) at Dec. 31, 2020		551,000,000				1,000
Balance, end of year (in shares) at Dec. 31, 2021		629,000,000				1,000
Balance, beginning of year at Dec. 31, 2020		$ 6	$ 6,914	$ (845)		$ 0	$ 2,548	$ 563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							0
Cash contribution from parent							130
Other							0
Net income (loss)	$ 1,486			1,486	$ 381			381
Dividend to parent								0
Balance, end of year at Dec. 31, 2021	$ 9,415	$ 6	8,529	154	3,622	$ 0	2,678	944
Balance, end of year (in shares) at Dec. 31, 2022	629,535,631	630,000,000				1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							38
Cash contribution from parent							1,143
Other							1
Net income (loss)	$ 1,057			1,057	510			510
Dividend to parent								(316)
Balance, end of year at Dec. 31, 2022	$ 10,042	$ 6	8,568	709	4,998	$ 0	3,860	1,138
Balance, end of year (in shares) at Dec. 31, 2023	631,225,829	631,000,000				1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent							0
Cash contribution from parent							885
Other							0
Net income (loss)	$ 917			917	593			593
Dividend to parent								(367)
Balance, end of year at Dec. 31, 2023	$ 9,667	$ 6	$ 8,604	$ 1,092	$ 6,109	$ 0	$ 4,745	$ 1,364