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Fair Value of Financial Assets and Liabilities - Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Derivative Liability, Noncurrent $ 77   $ 83
Mark-to-market derivative liabilities (current liabilities) 23   8
Fair Value, Inputs, Level 3 [Member]      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance (44) $ (182)  
Total realized / unrealized gains (losses)      
Included in net income(a) 1 1  
Included in regulatory assets (14) 75  
Purchases, sales, issuances and settlements      
Transfers out of Level 3   (1)  
Ending Balance (57) (107)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1  
Commonwealth Edison Co [Member]      
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Derivative Liability, Noncurrent 76   79
Mark-to-market derivative liabilities (current liabilities) 22   5
Commonwealth Edison Co [Member] | Fair Value, Recurring [Member]      
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Derivative Liability, Noncurrent (76)   79
Mark-to-market derivative liabilities (current liabilities) (22)   $ 5
Commonwealth Edison Co [Member] | Derivative [Member] | Interest Rate Swap [Member]      
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Realized Investment Gains (Losses) 11 6  
Commonwealth Edison Co [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance (84) (219)  
Total realized / unrealized gains (losses)      
Included in net income(a) 0 0  
Included in regulatory assets (14) 75  
Purchases, sales, issuances and settlements      
Transfers out of Level 3   0  
Ending Balance (98) (144)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0  
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 25 (69)  
Pepco Holdings LLC [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member]      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 40 35  
Total realized / unrealized gains (losses)      
Included in net income(a) 1 1  
Included in regulatory assets 0 0  
Purchases, sales, issuances and settlements      
Transfers out of Level 3   0  
Ending Balance 41 36  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1  
Potomac Electric Power Company [Member] | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member]      
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 40 35  
Total realized / unrealized gains (losses)      
Included in net income(a) 1 1  
Included in regulatory assets 0 0  
Purchases, sales, issuances and settlements      
Transfers out of Level 3   0  
Ending Balance 41 36  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 1