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Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ (267) $ (260)
Total realized / unrealized gains (losses)    
Included in net income 3 3
Included in regulatory assets/liabilities 82 0
Purchases, sales, issuances and settlements    
Settlements (2) (10)
Transfers into Level 3 2  
Ending Balance (182) (267)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 3 3
Commonwealth Edison Co [Member] | Derivative [Member] | Interest Rate Swap [Member]    
Purchases, sales, issuances and settlements    
Realized Investment Gains (Losses) 20 33
Commonwealth Edison Co [Member] | Derivative [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance (301) (301)
Total realized / unrealized gains (losses)    
Included in net income 0 0
Included in regulatory assets/liabilities 82 0
Purchases, sales, issuances and settlements    
Settlements 0 0
Transfers into Level 3 0  
Ending Balance (219) (301)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (62) 33
Pepco Holdings LLC [Member] | 6311 Life Insurance [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 34 41
Total realized / unrealized gains (losses)    
Included in net income 3 3
Included in regulatory assets/liabilities 0 0
Purchases, sales, issuances and settlements    
Settlements (2) (10)
Transfers into Level 3 0  
Ending Balance 35 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 3 3
Potomac Electric Power Company [Member] | 6311 Life Insurance [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 34 41
Total realized / unrealized gains (losses)    
Included in net income 3 3
Included in regulatory assets/liabilities 0 0
Purchases, sales, issuances and settlements    
Settlements (2) (10)
Transfers into Level 3 0  
Ending Balance 35 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 3 $ 3