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Revenue Recognition - Schedule of Disaggregate Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ (8,552) $ (8,612) $ (9,327)
Other 93 87 (6)
Revenues 8,643 8,696 9,321
Houston Electric      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (3,930) (3,684) (3,417)
Other 9 (7) (5)
Revenues 3,939 3,677 3,412
CERC      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (3,868) (4,083) (4,816)
Other 57 66 (16)
Revenues 3,925 4,149 4,800
Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (2) (3)  
Electric      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (4,558) (4,275) (4,095)
Other 32 15 13
Revenues 4,590 4,290 4,108
Electric | Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0  
Natural Gas      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (3,990) (4,210) (4,969)
Other 58 69 (23)
Revenues 4,046 4,276 4,946
Natural Gas | Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (2) (3)  
Corporate and Other      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers (4) (127) (263)
Other 3 3 4
Revenues 7 130 $ 267
Corporate and Other | Eliminations      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 0 $ 0