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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 01, 2023
Feb. 28, 2022
Jul. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Jul. 20, 2021
Class of Stock [Line Items]                  
Preferred stock, outstanding (in shares)       0   0   800,000  
Preferred stock       $ 0   $ 0   $ 790  
Preferred Stock Dividends and Other Adjustments [Abstract]                  
Preferred stock dividend requirement       26 $ 13 50 $ 37    
Total income allocated to preferred shareholders       26 13 50 37    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Beginning Balance       (32) (85) (31) (64)    
Net deferred gain from cash flow hedges       2 0 2 0    
Prior service cost       1 0 0 1    
Actuarial losses       0 2 0 4    
Settlement       0 1 0 14    
Tax benefit (expense)       0 9 0 5    
Net current period other comprehensive income (loss)       3 2 2 (19)    
Ending Balance       (29) (83) (29) (83)    
Other Pension, Postretirement and Supplemental Plans                  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Remeasurement of pension and other postretirement plans       0 (10) 0 (44)    
Houston Electric                  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Beginning Balance       0 0 0 0    
Net deferred gain from cash flow hedges       0 0 0 0    
Prior service cost       0 0 0 0    
Actuarial losses       0 0 0 0    
Settlement       0 0 0 0    
Tax benefit (expense)       0 0 0 0    
Net current period other comprehensive income (loss)       0 0 0 0    
Ending Balance       0 0 0 0    
Houston Electric | Other Pension, Postretirement and Supplemental Plans                  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Remeasurement of pension and other postretirement plans       0 0 0 0    
CERC                  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Beginning Balance       15 10 16 10    
Net deferred gain from cash flow hedges       0 0 0 0    
Prior service cost       0 0 (1) 0    
Actuarial losses       0 0 0 0    
Settlement       0 0 0 0    
Tax benefit (expense)       0 0 0 0    
Net current period other comprehensive income (loss)       0 0 (1) 0    
Ending Balance       15 10 15 10    
CERC | Other Pension, Postretirement and Supplemental Plans                  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                  
Remeasurement of pension and other postretirement plans       $ 0 $ 0 $ 0 $ 0    
Chief Executive Officer                  
Preferred Stock Dividends and Other Adjustments [Abstract]                  
Retention incentive agreement, shares issued (in shares)                 1,000,000
Chief Executive Officer | Restricted Stock Units (RSUs)                  
Preferred Stock Dividends and Other Adjustments [Abstract]                  
Restricted stock units granted (in shares)   400,000 400,000            
Remaining shares available to be awarded (in shares)     200,000            
Common Stock                  
Class of Stock [Line Items]                  
Common stock, dividends declared per share (in dollars per share)       $ 0.390 $ 0.360 $ 0.580 $ 0.530    
Common Stock dividends paid per share (in dollars per share)       0.190 0.180 0.570 0.520    
Series A Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, dividends declared (in dollars per share)       30.625 30.625 30.625 30.625    
Preferred stock dividends paid per share (in dollars per share)       30.625 $ 30.625 61.250 $ 61.250    
Redemption of Series A Preferred Stock (in shares) 800,000                
Preferred stock redemption price (per share) $ 1,000                
Preferred stock, liquidation preference (in dollars per share)       $ 1,000   $ 1,000      
Preferred stock, outstanding (in shares)       0   0   800,000  
Preferred stock       $ 0   $ 0   $ 790  
Preferred Stock Dividends and Other Adjustments [Abstract]                  
Preferred stock dividend requirement       $ 26 $ 13 $ 50 $ 37    
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, outstanding (in shares)       0   0   800,000  
Preferred stock       $ 0   $ 0   $ 790