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Earnings Per Share (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:        
Net income $ 228 $ 118 $ 578 $ 443
Less: Preferred stock dividend requirement (Note 18) 0 12 0 24
Income available to common shareholders - basic 228 106 578 419
Income available to common shareholders -diluted $ 228 $ 106 $ 578 $ 419
Denominator:        
Weighted average common shares outstanding - basic (in shares) 640,754 631,057 636,491 630,685
Plus: Incremental shares from assumed conversions:        
Weighted average common shares outstanding - diluted (in shares) 641,816 633,005 637,893 633,030
Earnings Per Common Share:        
Basic Earnings Per Common Share (in dollars per share) $ 0.36 $ 0.17 $ 0.91 $ 0.66
Diluted Earnings (Loss) Per Common Share        
Diluted Earnings Per Common Share (in dollars per share) $ 0.36 $ 0.17 $ 0.91 $ 0.66
Restricted stock        
Plus: Incremental shares from assumed conversions:        
Restricted stock (in shares) 1,062 1,948 1,402 2,345