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Supplemental Financial Information - Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment $ 680 $ 726
Amortization of regulatory assets 178 179
Amortization of intangible assets, net 2 6
Amortization of energy contract assets and liabilities   3
Nuclear fuel   66
ARO accretion   44
Depreciation, Amortization and Accretion, Net 860 1,024
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 45 44
Allowance for credit losses 70 78
Other decommissioning-related activity   36
Energy-related options   60
True-up adjustments to decoupling mechanisms and formula rates 279 29
Long-term incentive plan 2 25
Amortization of operating ROU asset 10 23
AFUDC - Equity (38) (36)
Change in environmental liabilities 25  
Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (282) (29)
Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (38) (36)
Commonwealth Edison Co [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 267 254
Amortization of regulatory assets 71 67
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 338 321
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 6 16
Allowance for credit losses 0 17
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 153 40
Long-term incentive plan 0 0
Amortization of operating ROU asset 1 1
AFUDC - Equity (10) (8)
Change in environmental liabilities 0  
Commonwealth Edison Co [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (153) (40)
Commonwealth Edison Co [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (10) (8)
PECO Energy Co [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 95 88
Amortization of regulatory assets 3 4
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 98 92
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs (3) (2)
Allowance for credit losses 37 27
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates (4) 6
Long-term incentive plan 0 0
Amortization of operating ROU asset 0 0
AFUDC - Equity (6) (7)
Change in environmental liabilities 0  
PECO Energy Co [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates 4 (6)
PECO Energy Co [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (6) (7)
Baltimore Gas and Electric Company [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 124 117
Amortization of regulatory assets 43 54
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 167 171
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 14 12
Allowance for credit losses 18 18
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 65 (12)
Long-term incentive plan 0 0
Amortization of operating ROU asset 1 7
AFUDC - Equity (3) (6)
Change in environmental liabilities 0  
Baltimore Gas and Electric Company [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (65) 12
Baltimore Gas and Electric Company [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (3) (6)
Pepco Holdings LLC [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 180 164
Amortization of regulatory assets 61 54
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 241 218
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 24 13
Allowance for credit losses 15 18
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 65 (5)
Long-term incentive plan 0 0
Amortization of operating ROU asset 7 7
AFUDC - Equity (19) (15)
Change in environmental liabilities 25  
Pepco Holdings LLC [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (68) 5
Pepco Holdings LLC [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (19) (15)
Potomac Electric Power Company [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 76 72
Amortization of regulatory assets 32 36
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 108 108
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 8 2
Allowance for credit losses 7 9
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 39 (7)
Long-term incentive plan 0 0
Amortization of operating ROU asset 1 2
AFUDC - Equity (14) (11)
Change in environmental liabilities 25  
Potomac Electric Power Company [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (39) 7
Potomac Electric Power Company [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (14) (11)
Delmarva Power and Light Company [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 51 45
Amortization of regulatory assets 9 12
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 60 57
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 4 1
Allowance for credit losses 5 6
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 9 (1)
Long-term incentive plan 0 0
Amortization of operating ROU asset 2 2
AFUDC - Equity (2) (2)
Change in environmental liabilities 0  
Delmarva Power and Light Company [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (11) 1
Delmarva Power and Light Company [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity (2) (2)
Atlantic City Electric Company [Member]    
Depreciation, Amortization and Accretion [Abstract]    
Property, plant and equipment 47 41
Amortization of regulatory assets 20 6
Amortization of intangible assets, net 0 0
Amortization of energy contract assets and liabilities   0
Nuclear fuel   0
ARO accretion   0
Depreciation, Amortization and Accretion, Net 67 47
Other Non-Cash Operating Activities [Abstract]    
Pension and non-pension postretirement benefit costs 4 3
Allowance for credit losses 3 3
Other decommissioning-related activity   0
Energy-related options   0
True-up adjustments to decoupling mechanisms and formula rates 17 3
Long-term incentive plan 0 0
Amortization of operating ROU asset 1 1
AFUDC - Equity (3) (2)
Change in environmental liabilities 0  
Atlantic City Electric Company [Member] | Other Non-Cash Activity    
Other Non-Cash Operating Activities [Abstract]    
True-up adjustments to decoupling mechanisms and formula rates (18) (3)
Atlantic City Electric Company [Member] | Return on borrowed funds    
Other Non-Cash Operating Activities [Abstract]    
AFUDC - Equity $ (3) $ (2)