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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Preferred Stock Dividends and Other Adjustments [Abstract]    
Preferred stock dividend requirement $ 0 $ 12
Total income allocated to preferred shareholders 0 12
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (35) (31)
Net deferred gain from cash flow hedges 3 0
Prior service cost 0 (1)
Actuarial losses 1 0
Other comprehensive income (loss) 2 (1)
Ending Balance (33) (32)
CERC    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 16 16
Net deferred gain from cash flow hedges 0 0
Prior service cost 0 (1)
Actuarial losses (1) 0
Other comprehensive income (loss) (1) (1)
Ending Balance 15 15
Other Pension, Postretirement and Supplemental Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Remeasurement of pension and other postretirement plans (2) 0
Other Pension, Postretirement and Supplemental Plans | CERC    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Remeasurement of pension and other postretirement plans $ 0 $ 0
Common Stock    
Class of Stock [Line Items]    
Common stock, dividends declared per share (in dollars per share) $ 0 $ 0
Common Stock dividends paid per share (in dollars per share) 0.200 0.190
Series A Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, dividends declared (in dollars per share) 0 0
Preferred stock dividends paid per share (in dollars per share) $ 0 $ 30.625
Preferred Stock Dividends and Other Adjustments [Abstract]    
Preferred stock dividend requirement $ 0 $ 12