v3.26.1
Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 20, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (750)   $ (750)   $ (762)
Corporate, Non-Segment | Notes Payable to Banks            
Derivative [Line Items]            
Derivative, Notional Amount $ 775          
Derivative, cash received on hedge 6          
PECO Energy Co            
Derivative [Line Items]            
Incremental collateral for loss of investment grade credit rating   26   26    
Baltimore Gas and Electric Company            
Derivative [Line Items]            
Incremental collateral for loss of investment grade credit rating   16   16    
Delmarva Power and Light Company            
Derivative [Line Items]            
Incremental collateral for loss of investment grade credit rating   13   13    
InterestRateSwapNotionalTerminated | Cash Flow Hedging            
Derivative [Line Items]            
Derivative, Notional Amount 550          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (4)          
InterestRateSwapNotional5YR | Cash Flow Hedging            
Derivative [Line Items]            
Derivative, Notional Amount   $ 60   60   335
Derivative, term of contract   5 years        
InterestRateSwapNotional10YR | Cash Flow Hedging            
Derivative [Line Items]            
Derivative, Notional Amount   $ 150   150   365
Derivative, term of contract   10 years        
InterestRateSwapNotional10YR | Cash Flow Hedging | Corporate, Non-Segment            
Derivative [Line Items]            
Derivative, Notional Amount   $ 30   30    
Interest Rate Swap | Cash Flow Hedging            
Derivative [Line Items]            
Derivative, Notional Amount   210   210   $ 700
Derivative, Gain (Loss) on Derivative, Net   1 $ 4 2 $ 13  
Derivative, Gain (Loss) on Derivative, Net   $ 1 $ 4 $ 2 $ 13