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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 90,844 $ 85,006
Accumulated depreciation and amortization 17,251 15,930
Property, plant, and equipment, net 73,593 69,076
Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 74,102 69,034
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 $ 8,818 8,126
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 $ 2,510 2,521
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 $ 4,589 4,534
Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 825 791
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 $ 36,310 34,186
Accumulated depreciation and amortization 7,222 6,673
Property, plant, and equipment, net 29,088 27,513
Commonwealth Edison Co | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 34,834 32,906
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 1,369 1,174
Commonwealth Edison Co | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 107 106
Commonwealth Edison Co | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 30 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 $ 17,225 16,203
Accumulated depreciation and amortization 4,097 4,078
Property, plant, and equipment, net 13,128 12,125
PECO Energy Co | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 11,295 10,719
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 $ 3,905 3,619
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 $ 1,083 1,071
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 $ 879 744
PECO Energy Co | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 63 50
Average  Service Life (years) 50 years  
Baltimore Gas and Electric Company    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 16,846 15,921
Accumulated depreciation and amortization 4,744 4,583
Property, plant, and equipment, net 12,102 11,338
Baltimore Gas and Electric Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 10,537 9,993
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 $ 4,428 4,074
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 $ 1,275 1,317
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 $ 561 487
Baltimore Gas and Electric Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 45 50
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 $ 22,026 20,304
Accumulated depreciation and amortization 3,175 2,618
Property, plant, and equipment, net 18,851 17,686
Pepco Holdings LLC | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 19,153 17,165
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 $ 748 696
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 $ 243 228
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 $ 1,762 2,101
Pepco Holdings LLC | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 120 114
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 $ 13,714 12,861
Accumulated depreciation and amortization 4,284 4,067
Property, plant, and equipment, net 9,430 8,794
Potomac Electric Power Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 12,429 11,270
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 1,226 1,526
Potomac Electric Power Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 59 65
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 $ 7,090 6,592
Accumulated depreciation and amortization 1,925 1,772
Property, plant, and equipment, net 5,165 4,820
Delmarva Power & Light Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 5,590 5,231
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 $ 905 855
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 $ 211 206
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 $ 345 271
Delmarva Power & Light Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 39 29
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 $ 5,876 5,541
Accumulated depreciation and amortization 1,684 1,551
Property, plant, and equipment, net 4,192 3,990
Atlantic City Electric Company | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 5,659 5,219
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 189 296
Atlantic City Electric Company | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 28 $ 26
Atlantic City Electric Company | Other Property Plant and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 13 years  
Atlantic City Electric Company | Other Property Plant and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Average  Service Life (years) 15 years