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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Class of Stock [Line Items]        
Common stock, dividends declared per share (in dollars per share) $ 0.410 $ 0.390 $ 0.610 $ 0.580
Common Stock dividends paid per share (in dollars per share) $ 0.200 $ 0.190 $ 0.600 $ 0.570
Preferred Stock Dividends and Other Adjustments [Abstract]        
Preferred stock dividend requirement $ 0 $ 26 $ 0 $ 50
Total income allocated to preferred shareholders 0 26 0 50
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance (30) (32) (35) (31)
Net deferred gain from cash flow hedges 0 2 4 2
Prior service cost (benefit) 0 1 2 0
Actuarial losses (gain) 1 0 2 0
Reclassification of deferred loss from cash flow hedges realized in net income (1) 0 (1) 0
Other comprehensive income (loss) 0 3 5 2
Ending Balance (30) (29) (30) (29)
Other Pension, Postretirement and Supplemental Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Remeasurement of pension and other postretirement plans     (2) 0
CERC        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance 15 15 16 16
Net deferred gain from cash flow hedges 0 0 0 0
Prior service cost (benefit) 0 0 0 (1)
Actuarial losses (gain) 0 0 (1) 0
Reclassification of deferred loss from cash flow hedges realized in net income 0 0 0 0
Other comprehensive income (loss) 0 0 (1) (1)
Ending Balance $ 15 $ 15 15 15
CERC | Other Pension, Postretirement and Supplemental Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Remeasurement of pension and other postretirement plans     $ 0 $ 0
Series A Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, dividends declared (in dollars per share) $ 0 $ 30.625 $ 0 $ 30.625
Preferred stock dividends paid per share (in dollars per share) $ 0 $ 30.625 $ 0 $ 61.250
Preferred Stock Dividends and Other Adjustments [Abstract]        
Preferred stock dividend requirement $ 0 $ 26 $ 0 $ 50