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Earnings Per Share (CenterPoint Energy) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income	$ 297	$ 350
Denominator:
Weighted average common shares outstanding - basic (in shares)	652,161	632,228
Weighted average common shares outstanding - diluted (in shares)	653,319	633,970
Earnings Per Common Share [Abstract]
Basic (in dollars per share)	$ 0.45	$ 0.55
Diluted (in dollars per share)	$ 0.45	$ 0.55
Restricted stock
Denominator:
Restricted stock (in shares)	1,158	1,742

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