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Earnings Per Share (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income $ 1,019 $ 917 $ 1,057
Less: Preferred stock dividend requirement 0 50 49
Income available to common shareholders - diluted 1,019 867 1,008
Income available to common shareholders - basic $ 1,019 $ 867 $ 1,008
Denominator:      
Weighted average common shares outstanding - basic (in shares) 643,163 630,947 629,415
Plus: Incremental shares from assumed conversions:      
Weighted average common shares outstanding - diluted (in shares) 644,137 633,179 632,346
Earnings per Common Share:      
Basic (in dollars per share) $ 1.58 $ 1.37 $ 1.60
Diluted (in dollars per share) $ 1.58 $ 1.37 $ 1.59
Restricted stock      
Plus: Incremental shares from assumed conversions:      
Restricted stock (in shares) 974 2,232 2,931
Series B Preferred Stock      
Numerator:      
Less: Preferred stock dividend requirement $ 0 $ 50 $ 49