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Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 2,956 $ 2,594
Other (35) 26
Total 2,920 2,620
Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers (1)  
Houston Electric    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 892 910
Other (8) (9)
Total 884 901
CERC    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,819 1,485
Other (31) 27
Total 1,788 1,512
Electric    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,072 1,052
Other (6) (3)
Total 1,066 1,049
Electric | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 0  
Natural Gas    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,883 1,541
Other (30) 29
Total 1,852 1,570
Natural Gas | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers (1)  
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1 1
Other 1 0
Total 2 $ 1
Corporate and Other | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 0