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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value               $ 0
Fair Value, Inputs, Level 3 [Member]                
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,179 $ 1,106 $ 1,179 $ 1,106 $ 838 $ 907 $ 1,283 966
Total realized / unrealized gains (losses)                
Included in net income 275 (112) 46 74        
Included in noncurrent payables to affiliates 0 0 0 0        
Included in regulatory assets (23) 12 (3) 7        
Change in collateral 106 (49) 187 57        
Purchases, sales, issuances and settlements                
Purchases 51 30 110 119        
Sales (1) (1) (1) (4)        
Settlements (53) (26) (70) (74)        
Transfers into Level 3 3 (15) 3 (23)        
Transfers out of Level 3 (17) (16) 0 16        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 339 3 191 259        
Fair Value, Inputs, Level 3 [Member] | Consolidation, Eliminations [Member]                
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 0 0 0 0 0 0  
Total realized / unrealized gains (losses)                
Included in net income 0 0 0 0        
Included in noncurrent payables to affiliates (10) 3 (21) (3)        
Included in regulatory assets 10 (3) 21 3        
Change in collateral 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        
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 65 120 145 192        
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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,412 1,322 1,412 1,322 1,039 1,118 1,527 1,200
Total realized / unrealized gains (losses)                
Included in net income 274 (113) 44 72        
Included in noncurrent payables to affiliates 10 (3) 21 3        
Included in regulatory assets 0 0 0 0        
Change in collateral 106 (49) 187 57        
Purchases, sales, issuances and settlements                
Purchases 51 30 110 119        
Sales (1) (1) (1) (4)        
Settlements (53) (38) (70) (86)        
Transfers into Level 3 3 (15) 3 (23)        
Transfers out of Level 3 (17) (16) 0 (16)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 338 3 189 259        
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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 539 585 539 585 540 543 609 648
Total realized / unrealized gains (losses)                
Included in net income 2 0 3 1        
Included in noncurrent payables to affiliates 10 (3) 21 3        
Included in regulatory assets   0   0        
Change in collateral 0 0 0 0        
Purchases, sales, issuances and settlements                
Purchases 40 17 42 19        
Sales 0 0 0 0        
Settlements (53) (38) (70) (86)        
Transfers into Level 3 0 0 0 0        
Transfers out of Level 3 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 (4) 3 (4)        
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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 873 737 873 737 499 575 918 552
Total realized / unrealized gains (losses)                
Included in net income 272 (113) 41 71        
Included in noncurrent payables to affiliates 0 0 0 0        
Included in regulatory assets   0   0        
Change in collateral 106 (49) 187 57        
Purchases, sales, issuances and settlements                
Purchases 11 13 68 100        
Sales (1) (1) (1) (4)        
Settlements 0 0 0 0        
Transfers into Level 3 3 (15) 3 (23)        
Transfers out of Level 3 (17) (16) 0 (16)        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 337 7 186 263        
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) 8 13 4 10        
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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value (273) (252) (273) (252) (240) (249) (267) (256)
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 (33) 15 (24) 4        
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        
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) (41) 37 (11) 6        
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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 40 36 40 36 39 38 23 22
Total realized / unrealized gains (losses)                
Included in net income 1 1 2 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 0 12 0 12        
Transfers into Level 3 0 0 0 0        
Transfers out of Level 3 0 0 0 0        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 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]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 40 36 40 36 $ 39 $ 38 $ 23 $ 22
Total realized / unrealized gains (losses)                
Included in net income 1 1 2 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 0 12 0 12        
Transfers into Level 3 0 0 0 0        
Transfers out of Level 3 0 0 0          
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) $ 1 $ 0 $ 2 $ 0