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Earnings Per Share (CenterPoint Energy) (Tables)
12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
The following table reconciles numerators and denominators of CenterPoint Energy’s basic and diluted earnings per common share. Basic earnings per common share is determined by dividing Income available to common shareholders - basic by the Weighted average common shares outstanding - basic for the applicable period. Diluted earnings per common share is determined by the inclusion of potentially dilutive common stock equivalent shares that may occur if securities to issue Common Stock were exercised or converted into Common Stock.
 For the Year Ended December 31,
 202120202019
 (in millions, except per share and share amounts)
Numerator:
Income from continuing operations$668 $483 $515 
Less: Preferred stock dividend requirement (Note 13)95 144 117 
Less: Amortization of beneficial conversion feature (Note 13)— 32 — 
Less: Undistributed earnings allocated to preferred shareholders (1)
— — — 
Income available to common shareholders from continuing operations - basic and diluted573 307 398 
Income (loss) available to common shareholders from discontinued operations - basic and diluted
818 (1,256)276 
Income (loss) available to common shareholders - basic and diluted$1,391 $(949)$674 
Denominator:
Weighted average common shares outstanding - basic592,933,000 531,031,000 502,050,000 
Plus: Incremental shares from assumed conversions:
Restricted stock5,181,000 — 3,107,000 
Series C Preferred Stock (3)
11,824,000 — — 
Weighted average common shares outstanding - diluted609,938,000 531,031,000 505,157,000 
Anti-dilutive Incremental Shares Excluded from Denominator for Diluted Earnings (Loss) Computation:
Restricted stock— 3,690,000 — 
Series B Preferred Stock (2)
23,906,000 35,922,000 34,354,000 
Series C Preferred Stock (3)
— 23,807,000 — 
 For the Year Ended December 31,
 202120202019
 (in millions, except per share and share amounts)
Earnings (loss) per common share:
Basic earnings per common share - continuing operations$0.97 $0.58 $0.79 
Basic earnings (loss) per common share - discontinued operations
1.38 (2.37)0.55 
Basic Earnings (Loss) Per Common Share$2.35 $(1.79)$1.34 
Diluted earnings per common share - continuing operations$0.94 $0.58 $0.79 
Diluted earnings (loss) per common share - discontinued operations
1.34 (2.37)0.54 
Diluted Earnings (Loss) Per Common Share$2.28 $(1.79)$1.33 

(1)There were no undistributed earnings to be allocated to participating securities for the years ended December 31, 2021 and 2020.
(2)As of December 31, 2021, all of the outstanding Series B Preferred Stock have been converted into Common Stock. For further information, see Note 13.
(3)As of December 31, 2021, all of the outstanding Series C Preferred Stock have been converted into Common Stock. For further information, see Note 13.