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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 426 $ 1,088 $ 660 $ 1,068
Total realized / unrealized gains (losses)        
Included in net income (357) (166) (632) (156)
Included in noncurrent payables to affiliates 0   0 0
Included in regulatory assets 36 (4) 43 (18)
Change in collateral (282) (42) (338) (41)
Purchases, sales, issuances and settlements        
Purchases 7 30 115 71
Sales 1 (2) 1 (24)
Settlements (28) (1) (48) (15)
Transfers into Level 3 1 (9) 1 (6)
Transfers out of Level 3 (39) (11) (37) 4
Ending Balance (235) 883 (235) 883
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (372) (72) (518) 115
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 (6)   (7) 1
Included in regulatory assets 6 0 7 (1)
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 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 15 94 (114) 271
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 686 1,360 927 1,328
Total realized / unrealized gains (losses)        
Included in net income (358) (167) (634) (158)
Included in noncurrent payables to affiliates 6   7 (1)
Included in regulatory assets 0 0 0 0
Change in collateral (282) (42) (338) (41)
Purchases, sales, issuances and settlements        
Purchases 7 30 115 71
Sales 1 (2) 1 (24)
Settlements (26) (1) (46) (15)
Transfers into Level 3 1 (9) 1 (6)
Transfers out of Level 3 (39) (11) (37) 4
Ending Balance (4) 1,158 (4) 1,158
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (373) (73) (520) 113
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 479 498 497 511
Total realized / unrealized gains (losses)        
Included in net income 1 (1) 2 (2)
Included in noncurrent payables to affiliates 6   7 (1)
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 1 3 1 6
Sales 0 0 0 0
Settlements (26) (1) (46) (15)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 461 499 461 499
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 (1) 2 (2)
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 207 862 430 817
Total realized / unrealized gains (losses)        
Included in net income (359) (166) (636) (156)
Included in noncurrent payables to affiliates 0   0 0
Included in regulatory assets 0 0 0 0
Change in collateral (282) (42) (338) (41)
Purchases, sales, issuances and settlements        
Purchases 6 27 114 65
Sales 1 (2) 1 (24)
Settlements 0 0 0 0
Transfers into Level 3 1 (9) 1 (6)
Transfers out of Level 3 (39) (11) (37) 4
Ending Balance (465) 659 (465) 659
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (374) (72) (522) 115
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) 5 8 13 18
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 (295) (314) (301) (301)
Total realized / unrealized gains (losses)        
Included in net income 0 0 0 0
Included in noncurrent payables to affiliates 0   0 0
Included in regulatory assets 30 (4) 36 (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 0
Transfers out of Level 3 0 0 0 0
Ending Balance (265) (318) (265) (318)
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) (25) (12) (23) (35)
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 42 34 41
Total realized / unrealized gains (losses)        
Included in net income 1 1 2 2
Included in noncurrent payables to affiliates 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 (2) 0 (2) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 43 34 43
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 1   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 35 42 34 41
Total realized / unrealized gains (losses)        
Included in net income 1 1 2 2
Included in noncurrent payables to affiliates 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 (2) 0 (2) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 43 $ 34 43
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 1   $ 2