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Earnings Per Share (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net income $ 193 $ 282 $ 771 $ 725
Less: Preferred stock dividend requirement (Note 18) 0 26 0 50
Income available to common shareholders - basic 193 256 771 675
Income available to common shareholders -diluted $ 193 $ 256 $ 771 $ 675
Denominator:        
Weighted average common shares outstanding - basic (in shares) 647,797 631,185 640,287 630,854
Plus: Incremental shares from assumed conversions:        
Weighted average common shares outstanding - diluted (in shares) 648,214 633,043 641,361 633,037
Earnings Per Common Share:        
Basic (in dollars per share) $ 0.30 $ 0.41 $ 1.20 $ 1.07
Diluted Earnings (Loss) Per Common Share        
Diluted (in dollars per share) $ 0.30 $ 0.40 $ 1.20 $ 1.07
Restricted stock        
Plus: Incremental shares from assumed conversions:        
Restricted stock (in shares) 417 1,858 1,074 2,183