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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Mark-to-market derivative liabilities (current liabilities) $ 25   $ 25   $ 74
Mark-to-market derivative liabilities (noncurrent liabilities) 180   180   106
Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Beginning Balance (116) $ (91) (90) $ (44)  
Total realized / unrealized gains (losses)          
Included in net income 0 0 1 2  
Included in regulatory assets/liabilities (26) (1) (32) (50)  
Purchases, sales, issuances and settlements          
Settlements (1)   (22)    
Ending Balance (143) (92) (143) (92)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 2 2  
Commonwealth Edison Co          
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Mark-to-market derivative liabilities (current liabilities) 25   25   27
Mark-to-market derivative liabilities (noncurrent liabilities) 140   140   106
Commonwealth Edison Co | 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) 25   25   27
Mark-to-market derivative liabilities (noncurrent liabilities) 140   140   $ 106
Other current assets 0   0    
Other deferred debits (noncurrent assets) 0   0    
Commonwealth Edison Co | Derivative [Member] | Interest Rate Swap          
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]          
Realized Investment Gains (Losses) 5 4 28 23  
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Beginning Balance (139) (133) (133) (84)  
Total realized / unrealized gains (losses)          
Included in net income 0 0 0 0  
Included in regulatory assets/liabilities (26) (1) (32) (50)  
Purchases, sales, issuances and settlements          
Settlements 0   0    
Ending Balance (165) (134) (165) (134)  
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) (31) (5) (60) (73)  
Pepco Holdings LLC | 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 22 42 41 40  
Total realized / unrealized gains (losses)          
Included in net income 0 (2) 2 0  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Settlements (1)   (22)    
Ending Balance 21 40 21 40  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 (2) 2 0  
Potomac Electric Power Company | 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 22 42 41 40  
Total realized / unrealized gains (losses)          
Included in net income 0 (2) 2 0  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Settlements (1)   (22)    
Ending Balance 21 40 21 40  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ (2) $ 2 $ 0