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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Mark-to-market derivative liabilities (current liabilities) $ 31   $ 31   $ 8
Derivative Liability, Noncurrent 109   109   83
Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Beginning Balance (57) $ (107) (44) $ (182)  
Total realized / unrealized gains (losses)          
Included in net income(a) 1 1 2 2  
Included in regulatory assets/liabilities (35) 56 (49) 131  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       (1)  
Ending Balance (91) (50) (91) (50)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1 2 2  
Commonwealth Edison Co [Member]          
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Mark-to-market derivative liabilities (current liabilities) 24   24   5
Derivative Liability, Noncurrent 109   109   79
Commonwealth Edison Co [Member] | Fair Value, Recurring [Member]          
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Mark-to-market derivative liabilities (current liabilities) (24) 0 (24) 0 5
Derivative Liability, Noncurrent (109) (103) (109) (103) $ 79
Mark-to-market derivative assets, current   15   15  
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) 8 (3) 19 3  
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 (98) (144) (84) (219)  
Total realized / unrealized gains (losses)          
Included in net income(a) 0 0 0 0  
Included in regulatory assets/liabilities (35) 56 (49) 131  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance (133) (88) (133) (88)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 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) 43 (59) 68 (128)  
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 41 36 40 35  
Total realized / unrealized gains (losses)          
Included in net income(a) 1 1 2 2  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance 42 37 42 37  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1 2 2  
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 41 36 40 35  
Total realized / unrealized gains (losses)          
Included in net income(a) 1 1 2 2  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance 42 37 42 37  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 1 $ 2 $ 2