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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended 84 Months Ended
Jan. 01, 2031
Aug. 16, 2022
Jul. 08, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2031
Income Tax Additional Narrative Information [Line Items]                      
Income tax expense related to separation           $ 148          
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount       $ 54   54     $ 43    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                 40    
Income Tax Credits and Adjustments                 15    
Tax Credit Carryforward, Valuation Allowance               $ 0      
Taxes Payable               182      
Notes Payable, Noncurrent               331      
Separation Cash Payment               9      
Income Taxes Receivable, Current               11      
General Business Tax Credit Carryforward                      
Income Tax Additional Narrative Information [Line Items]                      
Separation Cash Payment               21      
US Treasury (UST) Interest Rate                      
Income Tax Additional Narrative Information [Line Items]                      
Change in Enacted Tax Rate, Percent   15.00%                  
State and Local Jurisdiction                      
Income Tax Additional Narrative Information [Line Items]                      
Increase (Decrease) in Deferred Income Taxes               (54) 67 $ 27  
Increase (Decrease) in Income Taxes               $ (54) 67 $ 27  
EXCFederal And State                      
Income Tax Additional Narrative Information [Line Items]                      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount           40          
Income Tax Credits and Adjustments           17          
Total transaction costs taxes relating to the Separation           $ 24          
PENNSYLVANIA                      
Income Tax Additional Narrative Information [Line Items]                      
Change in Enacted Tax Rate, Percent     9.99%       4.99% 8.99%      
Increase (Decrease) in Deferred Income Taxes         $ 390            
Increase (Decrease) in Regulatory Assets         428            
Increase (Decrease) in Income Taxes         38            
PENNSYLVANIA | Forecast                      
Income Tax Additional Narrative Information [Line Items]                      
Change in Enacted Tax Rate, Percent                     (0.50%)
Atlantic City Electric Company                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               $ 0      
Atlantic City Electric Company | State and Local Jurisdiction                      
Income Tax Additional Narrative Information [Line Items]                      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit               14      
PECO Energy Co                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               $ 0      
Increase (Decrease) in Income Taxes                 $ 38    
PECO Energy Co | PENNSYLVANIA                      
Income Tax Additional Narrative Information [Line Items]                      
Change in Enacted Tax Rate, Percent     9.99%       4.99% 8.99%      
Increase (Decrease) in Deferred Income Taxes         390            
Increase (Decrease) in Regulatory Assets         428            
Increase (Decrease) in Income Taxes         $ 38            
PECO Energy Co | PENNSYLVANIA | Forecast                      
Income Tax Additional Narrative Information [Line Items]                      
Change in Enacted Tax Rate, Percent 4.99%                   (0.50%)
Commonwealth Edison Co                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               $ 0      
Delmarva Power & Light Company                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               0      
Baltimore Gas and Electric Company                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               0      
Potomac Electric Power Company                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               0      
Pepco Holdings LLC                      
Income Tax Additional Narrative Information [Line Items]                      
Tax Credit Carryforward, Valuation Allowance               $ 0