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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 84 Months Ended
Jan. 01, 2031
Jan. 01, 2023
Aug. 16, 2022
Jul. 08, 2022
Sep. 30, 2022
Jan. 01, 2031
Mar. 31, 2022
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         67    
Income Tax Credits and Adjustments         15    
Income Taxes Receivable, Current         55   $ 55
Notes Payable, Current         102   11
Notes Payable, Noncurrent         392   $ 484
Increase (Decrease) in Income Taxes   $ 200          
US Treasury (UST) Interest Rate              
Income Tax Additional Narrative Information [Line Items]              
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent     15.00%        
Atlantic City Electric Company [Member]              
Income Tax Additional Narrative Information [Line Items]              
Increase (Decrease) in Regulatory Assets         159    
PECO Energy Co [Member]              
Income Tax Additional Narrative Information [Line Items]              
Increase (Decrease) in Regulatory Assets         (301)    
State and Local Jurisdiction [Member] | Atlantic City Electric Company [Member]              
Income Tax Additional Narrative Information [Line Items]              
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit         14    
Federal and State              
Income Tax Additional Narrative Information [Line Items]              
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount         67    
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]              
Increase (Decrease) in Regulatory Assets         428    
Increase (Decrease) in Deferred Income Taxes         390    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 4.99% 8.99%   9.99%   (0.50%)  
Increase (Decrease) in Income Taxes         38    
PENNSYLVANIA | PECO Energy Co [Member]              
Income Tax Additional Narrative Information [Line Items]              
Increase (Decrease) in Regulatory Assets         428    
Increase (Decrease) in Deferred Income Taxes         390    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 4.99% 8.99%   9.99%   (0.50%)  
Increase (Decrease) in Income Taxes         $ 38