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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 96,627 $ 90,844
Accumulated depreciation and amortization 18,445 17,251
Property, plant, and equipment, net 78,182 73,593
Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 79,283 74,102
Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 80 years  
Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 9,599 8,818
Gas Distribution Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Gas Distribution Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 80 years  
Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 2,630 2,510
Common—electric and gas | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 4 years  
Common—electric and gas | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,306 4,589
Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 809 825
Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 4 years  
Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 61 years  
Commonwealth Edison Co    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 37,830 36,310
Accumulated depreciation and amortization 7,619 7,222
Property, plant, and equipment, net 30,211 29,088
Commonwealth Edison Co | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 36,493 34,834
Commonwealth Edison Co | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Commonwealth Edison Co | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 80 years  
Commonwealth Edison Co | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 0 0
Commonwealth Edison Co | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 0 0
Commonwealth Edison Co | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 1,219 1,369
Commonwealth Edison Co | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 118 107
Commonwealth Edison Co | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 29 years  
Commonwealth Edison Co | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 50 years  
PECO Energy Co    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 18,434 17,225
Accumulated depreciation and amortization 4,042 4,097
Property, plant, and equipment, net 14,392 13,128
PECO Energy Co | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 12,234 11,295
PECO Energy Co | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
PECO Energy Co | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 70 years  
PECO Energy Co | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,247 3,905
PECO Energy Co | Gas Distribution Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
PECO Energy Co | Gas Distribution Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 70 years  
PECO Energy Co | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,064 1,083
PECO Energy Co | Common—electric and gas | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
PECO Energy Co | Common—electric and gas | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 55 years  
PECO Energy Co | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 813 879
PECO Energy Co | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 76 63
Average  Service Life (years) 50 years  
Baltimore Gas and Electric Company    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 18,139 16,846
Accumulated depreciation and amortization 5,005 4,744
Property, plant, and equipment, net 13,134 12,102
Baltimore Gas and Electric Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 11,131 10,537
Baltimore Gas and Electric Company | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Baltimore Gas and Electric Company | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 80 years  
Baltimore Gas and Electric Company | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,796 4,428
Baltimore Gas and Electric Company | Gas Distribution Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Baltimore Gas and Electric Company | Gas Distribution Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 80 years  
Baltimore Gas and Electric Company | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,385 1,275
Baltimore Gas and Electric Company | Common—electric and gas | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 4 years  
Baltimore Gas and Electric Company | Common—electric and gas | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 50 years  
Baltimore Gas and Electric Company | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 779 561
Baltimore Gas and Electric Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 48 45
Baltimore Gas and Electric Company | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 20 years  
Baltimore Gas and Electric Company | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 50 years  
Pepco Holdings LLC    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 23,781 22,026
Accumulated depreciation and amortization 3,728 3,175
Property, plant, and equipment, net 20,053 18,851
Pepco Holdings LLC | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 21,130 19,153
Pepco Holdings LLC | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Pepco Holdings LLC | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Pepco Holdings LLC | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 821 748
Pepco Holdings LLC | Gas Distribution Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Pepco Holdings LLC | Gas Distribution Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Pepco Holdings LLC | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 272 243
Pepco Holdings LLC | Common—electric and gas | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Pepco Holdings LLC | Common—electric and gas | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Pepco Holdings LLC | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,472 1,762
Pepco Holdings LLC | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 86 120
Pepco Holdings LLC | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 10 years  
Pepco Holdings LLC | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 43 years  
Potomac Electric Power Company    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 14,619 13,714
Accumulated depreciation and amortization 4,522 4,284
Property, plant, and equipment, net 10,097 9,430
Potomac Electric Power Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 13,593 12,429
Potomac Electric Power Company | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Potomac Electric Power Company | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Potomac Electric Power Company | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 0 0
Potomac Electric Power Company | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 0 0
Potomac Electric Power Company | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 1,002 1,226
Potomac Electric Power Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 24 59
Potomac Electric Power Company | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 10 years  
Potomac Electric Power Company | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 33 years  
Delmarva Power & Light Company    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 7,615 7,090
Accumulated depreciation and amortization 2,075 1,925
Property, plant, and equipment, net 5,540 5,165
Delmarva Power & Light Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 6,086 5,590
Delmarva Power & Light Company | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Delmarva Power & Light Company | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Delmarva Power & Light Company | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 976 905
Delmarva Power & Light Company | Gas Distribution Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Delmarva Power & Light Company | Gas Distribution Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Delmarva Power & Light Company | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 241 211
Delmarva Power & Light Company | Common—electric and gas | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Delmarva Power & Light Company | Common—electric and gas | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Delmarva Power & Light Company | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 275 345
Delmarva Power & Light Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 37 39
Delmarva Power & Light Company | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 10 years  
Delmarva Power & Light Company | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 43 years  
Atlantic City Electric Company    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 6,164 5,876
Accumulated depreciation and amortization 1,798 1,684
Property, plant, and equipment, net 4,366 4,192
Atlantic City Electric Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 5,947 5,659
Atlantic City Electric Company | Electric—transmission and distribution | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 5 years  
Atlantic City Electric Company | Electric—transmission and distribution | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 75 years  
Atlantic City Electric Company | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 0 0
Atlantic City Electric Company | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 0 0
Atlantic City Electric Company | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 187 189
Atlantic City Electric Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 30 $ 28
Atlantic City Electric Company | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 10 years  
Atlantic City Electric Company | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 43 years