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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 84 Months Ended
Jan. 01, 2031
Jan. 01, 2023
Jul. 08, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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       18       $ 55
Notes Payable, Current       169       11
Notes Payable, Noncurrent       362       $ 484
State and Local Jurisdiction [Member]                
Income Tax Additional Narrative Information [Line Items]                
Increase (Decrease) in Deferred Income Taxes       67 $ 27 $ 66    
Increase (Decrease) in Income Taxes       67 $ 27 $ 66    
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]                
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        
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        
Change in Enacted Tax Rate, Percent 4.99% 8.99% 9.99%       (0.50%)  
Increase (Decrease) in Income Taxes       $ 38