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Supplemental Financial Information - Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Supplemental Statement of Operations Information [Line Items]        
Operating Lease Income $ 30 $ 30 $ 48 $ 48
Variable Lease Income 76 80 225 209
Decommissioning-Related Activities [Abstract]        
Net realized income on NDT funds - Regulatory agreement units 50 67 127 197
Net realized income on NDT funds - Non-regulatory agreement units 23 33 127 316
Net unrealized gains on NDT funds - Regulatory agreement units 398 89 111 565
Net unrealized gains on NDT funds - Non-regulatory agreement units 254 55 1 236
Regulatory offset to NDT fund-related activities (359) (125) (192) (611)
Decommissioning-related activities 366 119 174 703
AFUDC - Equity 27 22 76 64
Non-service net periodic benefit cost 15 (2) 38 8
Exelon Generation Co L L C [Member]        
Supplemental Statement of Operations Information [Line Items]        
Operating Lease Income 28 29 43 44
Variable Lease Income 76 80 224 206
Decommissioning-Related Activities [Abstract]        
Net realized income on NDT funds - Regulatory agreement units 50 67 127 197
Net realized income on NDT funds - Non-regulatory agreement units 23 33 127 316
Net unrealized gains on NDT funds - Regulatory agreement units 398 89 111 565
Net unrealized gains on NDT funds - Non-regulatory agreement units 254 55 1 236
Regulatory offset to NDT fund-related activities (359) (125) (192) (611)
Decommissioning-related activities 366 119 174 703
AFUDC - Equity 0 0 0 0
Commonwealth Edison Co [Member]        
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 7 4 22 13
PECO Energy Co [Member]        
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 5 3 12 9
Baltimore Gas and Electric Company [Member]        
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 6 6 16 16
Pepco Holdings LLC [Member]        
Supplemental Statement of Operations Information [Line Items]        
Operating Lease Income 1 1 3 3
Variable Lease Income 0 0 1 3
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 9 9 26 26
Potomac Electric Power Company [Member]        
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 7 7 20 18
Delmarva Power and Light Company [Member]        
Supplemental Statement of Operations Information [Line Items]        
Operating Lease Income 1 1 3 3
Variable Lease Income 0 0 1 3
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity 1 1 3 3
Atlantic City Electric Company [Member]        
Decommissioning-Related Activities [Abstract]        
AFUDC - Equity $ 1 $ 1 $ 3 $ 4