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Supplemental Financial Information - Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     $ 2,024 $ 4,505
Amortization of regulatory assets     532 439
Amortization of intangible assets, net     10 44
Amortization of energy contract assets and liabilities     3 23
Nuclear fuel     66 810
ARO accretion     44 383
Depreciation, Amortization and Accretion, Net     2,679 6,204
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     124 304
Allowance for credit losses     130 155
Other decommissioning-related activity     36 (810)
Energy-related options     60 45
True-up adjustments to decoupling mechanisms and formula rates $ 64 $ (47) 92 129
Restructuring Costs       (67)
Long-term incentive plan     35 94
Amortization of operating ROU asset     47 146
AFUDC - Equity (38) (36) (112) (99)
Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (92) (129)
Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (112) (99)
Commonwealth Edison Co [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     770 721
Amortization of regulatory assets     212 172
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     982 893
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     45 97
Allowance for credit losses     40 34
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates 88 (32) 163 32
Restructuring Costs       1
Long-term incentive plan     0 0
Amortization of operating ROU asset     1 2
AFUDC - Equity (10) (10) (28) (23)
Commonwealth Edison Co [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (163) (32)
Commonwealth Edison Co [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (28) (23)
PECO Energy Co [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     267 249
Amortization of regulatory assets     10 10
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     277 259
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     (6) 5
Allowance for credit losses     32 36
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (5) 3 1 20
Restructuring Costs       0
Long-term incentive plan     0 0
Amortization of operating ROU asset     0 0
AFUDC - Equity (7) (7) (22) (19)
PECO Energy Co [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (1) (20)
PECO Energy Co [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (22) (19)
Baltimore Gas and Electric Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     355 324
Amortization of regulatory assets     115 110
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     470 434
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     34 45
Allowance for credit losses     18 7
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (8) (24) (40) (17)
Restructuring Costs       0
Long-term incentive plan     0 0
Amortization of operating ROU asset     14 22
AFUDC - Equity (5) (7) (17) (21)
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     40 17
Baltimore Gas and Electric Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (17) (21)
Pepco Holdings LLC [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     502 467
Amortization of regulatory assets     195 147
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     697 614
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     39 36
Allowance for credit losses     42 18
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (11) 6 (33) 94
Restructuring Costs       1
Long-term incentive plan     0 0
Amortization of operating ROU asset     21 21
AFUDC - Equity (16) (12) (45) (36)
Pepco Holdings LLC [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     33 (94)
Pepco Holdings LLC [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (45) (36)
Potomac Electric Power Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     214 204
Amortization of regulatory assets     98 98
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     312 302
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     6 5
Allowance for credit losses     21 9
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (8) 9 (15) 54
Restructuring Costs       0
Long-term incentive plan     0 0
Amortization of operating ROU asset     5 5
AFUDC - Equity (12) (9) (35) (30)
Potomac Electric Power Company [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     15 (54)
Potomac Electric Power Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (35) (30)
Delmarva Power and Light Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     141 126
Amortization of regulatory assets     31 31
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     172 157
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     3 2
Allowance for credit losses     9 3
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates 0 (2) (3) 17
Restructuring Costs       0
Long-term incentive plan     0 0
Amortization of operating ROU asset     6 7
AFUDC - Equity (2) (2) (5) (4)
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     3 (17)
Delmarva Power and Light Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (5) (4)
Atlantic City Electric Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     126 115
Amortization of regulatory assets     66 18
Amortization of intangible assets, net     0 0
Amortization of energy contract assets and liabilities     0 0
Nuclear fuel     0 0
ARO accretion     0 0
Depreciation, Amortization and Accretion, Net     192 133
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     9 8
Allowance for credit losses     12 6
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (3) 0 (14) 23
Restructuring Costs       0
Long-term incentive plan     0 0
Amortization of operating ROU asset     3 3
AFUDC - Equity $ (2) $ (1) (5) (2)
Atlantic City Electric Company [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     14 (23)
Atlantic City Electric Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     $ (5) $ (2)