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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 883 $ 1,179 $ 1,068 $ 907
Total realized / unrealized gains (losses)        
Included in net income (327) (171) (483) (125)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 32 4 14 1
Change in collateral (79) 41 (120) 227
Purchases, sales, issuances and settlements        
Purchases 66 53 136 163
Sales (3) (22) (27) (23)
Settlements 0 (18) (15) (88)
Transfers into Level 3   1 (5) 5
Transfers out of Level 3 9 (11) 13 (11)
Ending Balance 581 1,056 581 1,056
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (222) (18) (107) 173
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 (18) (11) (17) (32)
Included in regulatory assets 18 11 17 32
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 105 153 376 298
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 1,158 1,412 1,328 1,118
Total realized / unrealized gains (losses)        
Included in net income (315) (171) (473) (127)
Included in noncurrent payables to affiliates 18 11 17 32
Included in regulatory assets 0 0 0 0
Change in collateral (79) 41 (120) 227
Purchases, sales, issuances and settlements        
Purchases 66 53 136 163
Sales (3) (22) (27) (23)
Settlements (3) (18) (18) (88)
Transfers into Level 3   1 (5) 5
Transfers out of Level 3 9 (11) 13 (11)
Ending Balance 851 1,296 851 1,296
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (210) (18) (97) 171
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 499 539 511 543
Total realized / unrealized gains (losses)        
Included in net income 3 2 1 5
Included in noncurrent payables to affiliates 18 11 17 32
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 1 1 6 43
Sales 0 (21) 0 (21)
Settlements (3) (18) (18) (88)
Transfers into Level 3   0 1 0
Transfers out of Level 3 0 0 0 0
Ending Balance 518 514 518 514
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 3 2 1 5
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 659 873 817 575
Total realized / unrealized gains (losses)        
Included in net income (318) (173) (474) (132)
Included in noncurrent payables to affiliates 0 0 0 0
Included in regulatory assets 0 0 0 0
Change in collateral (79) 41 (120) 227
Purchases, sales, issuances and settlements        
Purchases 65 52 130 120
Sales (3) (1) (27) (2)
Settlements 0 0 0 0
Transfers into Level 3   1 (6) 5
Transfers out of Level 3 9 (11) 13 (11)
Ending Balance 333 782 333 782
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (213) (20) (98) 166
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 4 23 17
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 (318) (273) (301) (249)
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 14 (7) (3) (31)
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 (304) (280) (304) (280)
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) (9) (7) (26) (31)
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 43 40 41 38
Total realized / unrealized gains (losses)        
Included in net income (12) 0 (10) 2
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 3 0 3 0
Transfers into Level 3   0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 40 34 40
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (12) 0 (10) 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 43 40 41 38
Total realized / unrealized gains (losses)        
Included in net income (12) 0 (10) 2
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 3 0 3 0
Transfers into Level 3   0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 34 40 34 40
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ (12) $ 0 $ (10) $ 2