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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Inputs, Level 3 [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 1,179 $ 1,106 $ 907 $ 966
Total realized / unrealized gains (losses)        
Included in net income (171) (259) (125) (186)
Included in noncurrent payables to affiliates 0 0 0  
Included in regulatory assets 4 (11) 1 (3)
Change in collateral 41 (44) 227 14
Purchases, sales, issuances and settlements        
Purchases 53 96 163 215
Sales (22)   (23) (3)
Settlements (18) (29) (88) (103)
Transfers into Level 3 1 3 5 (21)
Transfers out of Level 3 (11) (6) (11) (23)
Ending Balance 1,056 856 1,056 856
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (18) (105) 173 154
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) 4 (32)  
Included in regulatory assets 11 (4) 32 0
Change in collateral 0   0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 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 153 155 298 347
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 1,412 1,322 1,118 1,200
Total realized / unrealized gains (losses)        
Included in net income (171) (260) (127) (189)
Included in noncurrent payables to affiliates 11 (4) 32  
Included in regulatory assets 0 0 0 0
Change in collateral 41 (44) 227 14
Purchases, sales, issuances and settlements        
Purchases 53 96 163 215
Sales (22)   (23) (3)
Settlements (18) (29) (88) (115)
Transfers into Level 3 1 3 5 (21)
Transfers out of Level 3 (11) (6) (11) (23)
Ending Balance 1,296 1,078 1,296 1,078
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (18) (105) 171 154
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 539 585 543 648
Total realized / unrealized gains (losses)        
Included in net income 2 (1) 5 (1)
Included in noncurrent payables to affiliates 11 (4) 32  
Included in regulatory assets 0 0 0 0
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 1 15 43 34
Sales (21)   (21) 0
Settlements (18) (29) (88) (115)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 514 566 514 566
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 2 (1) 5 (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 873 737 575 552
Total realized / unrealized gains (losses)        
Included in net income (173) (259) (132) (188)
Included in noncurrent payables to affiliates 0 0 0  
Included in regulatory assets 0 0   0
Change in collateral 41 (44) 227 14
Purchases, sales, issuances and settlements        
Purchases 52 81 120 181
Sales (1)   (2) (3)
Settlements 0 0 0 0
Transfers into Level 3 1 3 5 (21)
Transfers out of Level 3 (11) (6) (11) (23)
Ending Balance 782 512 782 512
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) (20) (104) 166 159
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) 4 3 17 12
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 (273) (252) (249) (256)
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 (7) (7) (31) (3)
Change in collateral 0 0 0 0
Purchases, sales, issuances and settlements        
Purchases 0 0 0 0
Sales 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 (280) (259) (280) (259)
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) (7) 4 (31) (9)
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 40 36 38 22
Total realized / unrealized gains (losses)        
Included in net income 0 1 2 3
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
Settlements 0 0 0 12
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending Balance 40 37 40 37
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 2 0
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 40 36 38 22
Total realized / unrealized gains (losses)        
Included in net income 0 1 2 3
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 0 0 12
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0  
Ending Balance 40 37 40 37
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 0 $ 0 $ 2 $ 0