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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, 2022
Mar. 31, 2021
Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ (182) $ (267)
Total realized / unrealized gains (losses)    
Included in net income 1 1
Included in regulatory assets 75 6
Purchases, sales, issuances and settlements    
Transfers out of Level 3 (1)  
Ending Balance (107) (260)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1
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 8
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 (219) (301)
Total realized / unrealized gains (losses)    
Included in net income 0 0
Included in regulatory assets 75 6
Purchases, sales, issuances and settlements    
Transfers out of Level 3 0  
Ending Balance (144) (295)
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) (69) (2)
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 35 34
Total realized / unrealized gains (losses)    
Included in net income 1 1
Included in regulatory assets 0 0
Purchases, sales, issuances and settlements    
Transfers out of Level 3 0  
Ending Balance 36 35
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 35 34
Total realized / unrealized gains (losses)    
Included in net income 1 1
Included in regulatory assets 0 0
Purchases, sales, issuances and settlements    
Transfers out of Level 3 0  
Ending Balance 36 35
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 1