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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ (235) $ 883 $ 660 $ 1,068
Total realized / unrealized gains (losses)        
Included in net income (967) (327) (1,600) (483)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 62 32 105 14
Change in collateral (413) (79) (751) (120)
Purchases, sales, issuances and settlements        
Purchases 8 66 123 136
Sales 6 (3) 7 (27)
Settlements (2) 0 (50) (15)
Transfers into Level 3 2   4 (5)
Transfers out of Level 3 (27) 9 (64) 13
Ending Balance (1,566) 581 (1,566) 581
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (1,001) (222) (1,521) (107)
Fair Value, Inputs, Level 3 [Member] | Consolidation, Eliminations [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance 0 0 0 0
Total realized / unrealized gains (losses)        
Included in net income 0 0 0 0
Included in noncurrent payables to affiliates (11) (18) (18) (17)
Included in regulatory assets 11 18 18 17
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0   0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 0 0 0 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0
Exelon Generation Co L L C [Member]        
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings 34 (105) (80) (376)
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance (4) 1,158 927 1,328
Total realized / unrealized gains (losses)        
Included in net income (967) (315) (1,602) (473)
Included in noncurrent payables to affiliates 11 18 18 17
Included in regulatory assets 0 0 0 0
Change in collateral (413) (79) (751) (120)
Purchases, sales, issuances and settlements        
Purchases 8 66 123 136
Sales 6 (3) 7 (27)
Settlements (2) (3) (48) (18)
Transfers into Level 3 2   4 (5)
Transfers out of Level 3 (27) 9 (64) 13
Ending Balance (1,386) 851 (1,386) 851
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (1,001) (210) (1,523) (97)
Exelon Generation Co L L C [Member] | Fair Value, Inputs, Level 3 [Member] | Nuclear Decommissioning Trust Fund Investments [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance 461 499 497 511
Total realized / unrealized gains (losses)        
Included in net income 3 3 4 1
Included in noncurrent payables to affiliates 11 18 18 17
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 2 1 3 6
Sales 0 0 0 0
Settlements (2) (3) (48) (18)
Transfers into Level 3 0   1 1
Transfers out of Level 3 0 0 0 0
Ending Balance 475 518 475 518
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 3 3 4 1
Exelon Generation Co L L C [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 (465) 659 430 817
Total realized / unrealized gains (losses)        
Included in net income (970) (318) (1,606) (474)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 0 0 0 0
Change in collateral (413) (79) (751) (120)
Purchases, sales, issuances and settlements        
Purchases 6 65 120 130
Sales 6 (3) 7 (27)
Settlements 0 0 0 0
Transfers into Level 3 2   3 (6)
Transfers out of Level 3 (27) 9 (64) 13
Ending Balance (1,861) 333 (1,861) 333
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (1,004) (213) (1,527) (98)
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) 2 5 15 23
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 (265) (318) (301) (301)
Total realized / unrealized gains (losses)        
Included in net income 0 0 0 0
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 51 14 87 (3)
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0   0 0
Transfers out of Level 3 0 0 0 0
Ending Balance (214) (304) (214) (304)
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) (49) (9) (72) 26
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 34 43 34 41
Total realized / unrealized gains (losses)        
Included in net income 0 (12) 2 (10)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 3 (2) 3
Transfers into Level 3 0   0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 34 34 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 (12) 2 (10)
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 34 43 34 41
Total realized / unrealized gains (losses)        
Included in net income 0 (12) 2 (10)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 3 (2) 3
Transfers into Level 3 0   0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 34 34 34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ (12) $ 2 $ (10)