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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ (50) $ (231) $ (182) $ (267)
Total realized / unrealized gains (losses)        
Included in net income(a) 1   3 2
Included in regulatory assets 45 51 176 87
Purchases, sales, issuances and settlements        
Settlements       (2)
Transfers out of Level 3     (1)  
Ending Balance (4) (180) (4) (180)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 0 3 2
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) (6) 2 (3) 15
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 (88) (265) (219) (301)
Total realized / unrealized gains (losses)        
Included in net income(a) 0   0 0
Included in regulatory assets 45 51 176 87
Purchases, sales, issuances and settlements        
Settlements       0
Transfers out of Level 3     0  
Ending Balance (43) (214) (43) (214)
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) (51) (49) (179) (72)
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 37 34 35 34
Total realized / unrealized gains (losses)        
Included in net income(a) 1   3 2
Included in regulatory assets 0 0 0 0
Purchases, sales, issuances and settlements        
Settlements       (2)
Transfers out of Level 3     0  
Ending Balance 38 34 38 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 0 3 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 37 34 35 34
Total realized / unrealized gains (losses)        
Included in net income(a) 1   3 2
Included in regulatory assets 0 0 0 0
Purchases, sales, issuances and settlements        
Settlements       (2)
Transfers out of Level 3     0  
Ending Balance 38 34 38 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 0 $ 3 $ 2