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Supplemental Financial Information - Cash Flow (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     $ 2,168 $ 2,073
Amortization of regulatory assets     507 537
Amortization of intangible assets, net     6 6
Accretion expense     2 0
Depreciation and amortization     2,683 2,616
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     181 152
Allowance for credit losses     170 86
True-up adjustments to decoupling mechanisms and formula rates $ (54) $ 108 (29) 513
Amortization of operating ROU asset     28 29
Change in environmental liabilities       37
AFUDC - Equity (38) (40) (116) (113)
Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     49 (522)
Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (116) (113)
Commonwealth Edison Co        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     869 815
Amortization of regulatory assets     255 230
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     1,124 1,045
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     53 19
Allowance for credit losses     17 4
True-up adjustments to decoupling mechanisms and formula rates (76) 135 (100) 405
Amortization of operating ROU asset     0 2
Change in environmental liabilities       0
AFUDC - Equity (13) (7) (32) (25)
Commonwealth Edison Co | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     100 (405)
Commonwealth Edison Co | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (32) (25)
PECO Energy Co        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     308 287
Amortization of regulatory assets     10 10
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     318 297
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     (1) (10)
Allowance for credit losses     79 31
True-up adjustments to decoupling mechanisms and formula rates 5 11 3 1
Amortization of operating ROU asset     0 0
Change in environmental liabilities       0
AFUDC - Equity (7) (10) (24) (22)
PECO Energy Co | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (3) (1)
PECO Energy Co | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (24) (22)
Baltimore Gas and Electric Company        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     369 381
Amortization of regulatory assets     105 106
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     474 487
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     45 41
Allowance for credit losses     23 4
True-up adjustments to decoupling mechanisms and formula rates 9 (22) 28 47
Amortization of operating ROU asset     5 4
Change in environmental liabilities       0
AFUDC - Equity (5) (4) (18) (11)
Baltimore Gas and Electric Company | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (28) (47)
Baltimore Gas and Electric Company | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (18) (11)
Pepco Holdings LLC        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     581 550
Amortization of regulatory assets     135 191
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     716 741
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     71 74
Allowance for credit losses     51 47
True-up adjustments to decoupling mechanisms and formula rates 8 (15) 40 59
Amortization of operating ROU asset     19 21
Change in environmental liabilities       37
AFUDC - Equity (12) (19) (42) (55)
Pepco Holdings LLC | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (20) (69)
Pepco Holdings LLC | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (42) (55)
Potomac Electric Power Company        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     249 232
Amortization of regulatory assets     58 97
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     307 329
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     24 26
Allowance for credit losses     25 27
True-up adjustments to decoupling mechanisms and formula rates 5 (18) 42 28
Amortization of operating ROU asset     4 5
Change in environmental liabilities       37
AFUDC - Equity (8) (15) (32) (42)
Potomac Electric Power Company | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     (42) (28)
Potomac Electric Power Company | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (32) (42)
Delmarva Power and Light Company        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     162 155
Amortization of regulatory assets     21 27
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     183 182
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     11 13
Allowance for credit losses     7 9
True-up adjustments to decoupling mechanisms and formula rates (3) (2) 1 10
Amortization of operating ROU asset     6 6
Change in environmental liabilities       0
AFUDC - Equity (3) (3) (9) (7)
Delmarva Power and Light Company | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     7 (15)
Delmarva Power and Light Company | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     (9) (7)
Atlantic City Electric Company        
Depreciation, Amortization and Accretion [Abstract]        
Property, plant and equipment     158 145
Amortization of regulatory assets     56 67
Amortization of intangible assets, net     0 0
Accretion expense     0 0
Depreciation and amortization     214 212
Other Non-Cash Operating Activities [Abstract]        
Pension and non-pension postretirement benefit costs     10 10
Allowance for credit losses     19 11
True-up adjustments to decoupling mechanisms and formula rates 6 5 (3) 21
Amortization of operating ROU asset     2 2
Change in environmental liabilities       0
AFUDC - Equity $ (1) $ (1) (1) (6)
Atlantic City Electric Company | Other Non-Cash Activity        
Other Non-Cash Operating Activities [Abstract]        
True-up adjustments to decoupling mechanisms and formula rates     15 (26)
Atlantic City Electric Company | Return on borrowed funds        
Other Non-Cash Operating Activities [Abstract]        
AFUDC - Equity     $ (1) $ (6)