v3.25.2
Related Party Transactions (Houston Electric and CERC) - Schedule of Amounts Charged For Services (Details) - Operation and maintenance expense - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Houston Electric        
Related Party Transaction [Line Items]        
Affiliate service charges (billings), net $ 0 $ (2) $ (1) $ (3)
CERC        
Related Party Transaction [Line Items]        
Affiliate service charges (billings), net 0 2 1 3
CenterPoint Energy | Houston Electric        
Related Party Transaction [Line Items]        
Corporate service charges 47 44 90 79
CenterPoint Energy | CERC        
Related Party Transaction [Line Items]        
Corporate service charges $ 51 $ 55 $ 106 $ 106