v3.25.2
Related Party Transactions (Houston Electric and CERC) - Schedule of Money Pool Activity (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Houston Electric    
Related Party Transaction [Line Items]    
Money pool investments (borrowings) $ (453) $ 368
Houston Electric | Investments    
Related Party Transaction [Line Items]    
Weighted average interest rate 4.65% 4.65%
CERC    
Related Party Transaction [Line Items]    
Money pool investments (borrowings) $ 1 $ 0
CERC | Investments    
Related Party Transaction [Line Items]    
Weighted average interest rate 4.65% 0.00%