Earnings Per Share (CenterPoint Energy) - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net income	$ 198	$ 228	$ 495	$ 578
Denominator:
Weighted average common shares outstanding - basic (in shares)	652,783	640,754	652,474	636,491
Weighted average common shares outstanding - diluted (in shares)	654,044	641,816	653,683	637,893
Earnings Per Common Share [Abstract]
Basic (in dollars per share)	$ 0.30	$ 0.36	$ 0.76	$ 0.91
Diluted (in dollars per share)	$ 0.30	$ 0.36	$ 0.76	$ 0.91
Restricted stock
Denominator:
Restricted stock (in shares)	1,060	1,062	1,109	1,402
Equity forwards
Denominator:
Equity forwards (in shares)	201	0	100	0

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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