v3.25.3
Related Party Transactions (Houston Electric and CERC) - Schedule of Money Pool Activity (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Houston Electric    
Related Party Transaction [Line Items]    
Money pool investments (borrowings) $ 509 $ 368
Houston Electric | Investments    
Related Party Transaction [Line Items]    
Weighted average interest rate 4.25% 4.65%
CERC    
Related Party Transaction [Line Items]    
Money pool investments (borrowings) $ 0 $ 0
CERC | Investments    
Related Party Transaction [Line Items]    
Weighted average interest rate 0.00% 0.00%