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Supplemental Financial Information - Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     $ 1,376 $ 3,043
Amortization of regulatory assets     357 291
Amortization of intangible assets, net     8 29
Amortization of energy contract assets and liabilities     3 13
Nuclear fuel     66 549
ARO accretion     44 255
Depreciation, Amortization and Accretion, Net     1,854 4,180
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     86 196
Allowance for credit losses     96 100
Other decommissioning-related activity     36 (636)
Energy-related options     60 20
True-up adjustments to decoupling mechanisms and formula rates $ (2) $ 47 27 176
Long-term incentive plan     40 62
Amortization of operating ROU asset     38 83
AFUDC - Equity (38) (34) (74) (64)
Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (27) (176)
Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (74) (64)
Commonwealth Edison Co [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     511 480
Amortization of regulatory assets     138 109
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     649 589
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     30 64
Allowance for credit losses     29 24
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates 35 9 75 64
Long-term incentive plan     0 0
Amortization of operating ROU asset     1 1
AFUDC - Equity (9) (9) (17) (13)
Commonwealth Edison Co [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (75) (64)
Commonwealth Edison Co [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (17) (13)
PECO Energy Co [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     177 165
Amortization of regulatory assets     8 8
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     185 173
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     (4) 4
Allowance for credit losses     21 17
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates 0 7 6 17
Long-term incentive plan     0 0
Amortization of operating ROU asset     0 0
AFUDC - Equity (8) (6) (15) (12)
PECO Energy Co [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (6) (17)
PECO Energy Co [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (15) (12)
Baltimore Gas and Electric Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     235 215
Amortization of regulatory assets     87 78
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     322 293
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     22 29
Allowance for credit losses     18 4
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (20) (10) (32) 8
Long-term incentive plan     0 0
Amortization of operating ROU asset     14 15
AFUDC - Equity (6) (7) (12) (14)
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     32 (8)
Baltimore Gas and Electric Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (12) (14)
Pepco Holdings LLC [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     335 309
Amortization of regulatory assets     124 95
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     459 404
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     26 24
Allowance for credit losses     29 9
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (17) 41 (22) 88
Long-term incentive plan     0 0
Amortization of operating ROU asset     14 14
AFUDC - Equity (15) (12) (30) (25)
Pepco Holdings LLC [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     22 (88)
Pepco Holdings LLC [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (30) (25)
Potomac Electric Power Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     145 135
Amortization of regulatory assets     68 64
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     213 199
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     4 3
Allowance for credit losses     16 5
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (1) 19 (7) 46
Long-term incentive plan     0 0
Amortization of operating ROU asset     4 3
AFUDC - Equity (11) (10) (22) (20)
Potomac Electric Power Company [Member] | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     7 (46)
Potomac Electric Power Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (22) (20)
Delmarva Power and Light Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     92 84
Amortization of regulatory assets     21 20
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     113 104
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     2 1
Allowance for credit losses     6 2
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (2) 10 (3) 19
Long-term incentive plan     0 0
Amortization of operating ROU asset     4 5
AFUDC - Equity (2) (1) (4) (3)
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 (19)
Delmarva Power and Light Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (4) (3)
Atlantic City Electric Company [Member]        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     83 76
Amortization of regulatory assets     35 11
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     118 87
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     6 5
Allowance for credit losses     7 2
Other decommissioning-related activity     0 0
Energy-related options     0 0
True-up adjustments to decoupling mechanisms and formula rates (15) 12 (12) 23
Long-term incentive plan     0 0
Amortization of operating ROU asset     2 2
AFUDC - Equity $ (2) $ (1) (4) (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     12 (23)
Atlantic City Electric Company [Member] | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     $ (4) $ (2)