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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 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) $ 44   $ 44   $ 8
Derivative Liability, Noncurrent 113   113   83
Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Beginning Balance (91) $ (50) (44) $ (182)  
Total realized / unrealized gains (losses)          
Included in net income 0 1 2 3  
Included in regulatory assets/liabilities (1) 45 (50) 176  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       (1)  
Ending Balance (92) (4) (92) (4)  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 1 2 3  
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) 21   21   5
Derivative Liability, Noncurrent 113   113   79
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) (21) 0 (21) 0 5
Derivative Liability, Noncurrent (113) (67) (113) (67) $ 79
Mark-to-market derivative assets, current   24   24  
Commonwealth Edison Co | 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) 4 6 23 3  
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 (133) (88) (84) (219)  
Total realized / unrealized gains (losses)          
Included in net income 0 0 0 0  
Included in regulatory assets/liabilities (1) 45 (50) 176  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance (134) (43) (134) (43)  
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) (5) 51 (73) 179  
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 42 37 40 35  
Total realized / unrealized gains (losses)          
Included in net income (2) 1 0 3  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance 40 38 40 38  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (2) 1 0 3  
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 42 37 40 35  
Total realized / unrealized gains (losses)          
Included in net income (2) 1 0 3  
Included in regulatory assets/liabilities 0 0 0 0  
Purchases, sales, issuances and settlements          
Transfers out of Level 3       0  
Ending Balance 40 38 40 38  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ (2) $ 1 $ 0 $ 3