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Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]              
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (736)   $ (736)     $ (726)
Corporate, Non-Segment | Notes Payable to Banks              
Derivative [Line Items]              
Derivative, Notional Amount $ 1,700            
Derivative, cash received on hedge 30            
PECO Energy Co              
Derivative [Line Items]              
Incremental collateral for loss of investment grade credit rating   18   18      
Baltimore Gas and Electric Company              
Derivative [Line Items]              
Incremental collateral for loss of investment grade credit rating   37   37      
Delmarva Power and Light Company              
Derivative [Line Items]              
Incremental collateral for loss of investment grade credit rating   9   9      
InterestRateSwapNotionalTerminated | Cash Flow Hedging              
Derivative [Line Items]              
Derivative, Notional Amount 1,300            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 33         $ 23  
InterestRateSwapNotional5YR | Cash Flow Hedging              
Derivative [Line Items]              
Derivative, Notional Amount   $ 602   602     655
Derivative, term of contract   5 years          
InterestRateSwapNotional5YR | Cash Flow Hedging | Corporate, Non-Segment              
Derivative [Line Items]              
Derivative, Notional Amount   $ 205   205      
InterestRateSwapNotional10YR | Cash Flow Hedging              
Derivative [Line Items]              
Derivative, Notional Amount   $ 603   603     655
Derivative, term of contract   10 years          
InterestRateSwapNotional10YR | Cash Flow Hedging | Corporate, Non-Segment              
Derivative [Line Items]              
Derivative, Notional Amount   $ 205   205      
Interest Rate Swap | Cash Flow Hedging              
Derivative [Line Items]              
Derivative, Notional Amount   1,205   1,205     1,310
Derivative, Gain (Loss) on Derivative, Net   29 $ 22 30 $ 31    
Derivative, Gain (Loss) on Derivative, Net   29 $ 22 30 $ 31    
Interest Rate Swap | Cash Flow Hedging | Corporate, Non-Segment              
Derivative [Line Items]              
Derivative, Notional Amount   $ 410   $ 410      
Interest Rate Cap | Economic Hedges              
Derivative [Line Items]              
Derivative, Notional Amount             1,000
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member]              
Derivative [Line Items]              
Total mark-to-market derivative liabilities             (22)
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member] | 2023              
Derivative [Line Items]              
Derivative, Notional Amount             $ 4,875