v3.26.3
Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 20, 2026
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Derivative [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (733)   $ (733)   $ (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   14   14    
Delmarva Power and Light Company            
Derivative [Line Items]            
Incremental collateral for loss of investment grade credit rating   10   10    
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   $ 240   240   365
Derivative, term of contract   10 years        
InterestRateSwapNotional10YR | Cash Flow Hedging | Corporate, Non-Segment            
Derivative [Line Items]            
Derivative, Notional Amount   $ 90   90    
Interest Rate Swap | Cash Flow Hedging            
Derivative [Line Items]            
Derivative, Notional Amount   300   300   $ 700
Derivative, Gain (Loss) on Derivative, Net   11 $ 1 13 $ 14  
Derivative, Gain (Loss) on Derivative, Net   $ 11 $ 1 $ 13 $ 14