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Earnings Per Share (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Numerator:    
Net income $ 350 $ 325
Less: Preferred stock dividend requirement (Note 18) 0 12
Income available to common shareholders - basic 350 313
Income available to common shareholders -diluted $ 350 $ 313
Denominator:    
Weighted average common shares outstanding - basic (in shares) 632,228 630,309
Plus: Incremental shares from assumed conversions:    
Weighted average common shares outstanding - diluted (in shares) 633,970 633,051
Earnings Per Common Share:    
Basic Earnings Per Common Share (in dollars per share) $ 0.55 $ 0.50
Diluted Earnings (Loss) Per Common Share    
Diluted Earnings Per Common Share (in dollars per share) $ 0.55 $ 0.49
Restricted stock    
Plus: Incremental shares from assumed conversions:    
Restricted stock (in shares) 1,742 2,742