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CONDENSED STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY (Unaudited) - HOUSTON ELECTRIC - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Houston Electric	Houston Electric Common Stock	Houston Electric Additional Paid-in-Capital	Houston Electric Retained Earnings	Houston Electric Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2023		631,000,000					1,000
Beginning balance at Dec. 31, 2023		$ 6	$ 8,604	$ 1,092	$ (35)		$ 0	$ 4,745	$ 1,364	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent								230
Net income	$ 350			350		$ 99			99
Dividend to parent									(36)
Ending balance (in shares) at Mar. 31, 2024		633,000,000					1,000
Ending balance at Mar. 31, 2024	$ 9,998	$ 6	8,583	1,442	(33)	6,402	$ 0	4,975	1,427	0
Beginning balance (in shares) at Dec. 31, 2024	651,727,276	652,000,000					1,000
Beginning balance at Dec. 31, 2024	$ 10,666	$ 6	9,105	1,572	(17)	7,159	$ 0	5,589	1,571	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent								0
Net income	$ 297			297		84			84
Dividend to parent									(90)
Ending balance (in shares) at Mar. 31, 2025	652,726,754	652,000,000					1,000
Ending balance at Mar. 31, 2025	$ 10,955	$ 6	$ 9,097	$ 1,869	$ (17)	$ 7,153	$ 0	$ 5,589	$ 1,565	$ (1)

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