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Property, Plant and Equipment Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 90,724 $ 73,814
Less: accumulated depreciation [1] 19,169 16,375
Property, plant and equipment, net 71,555 57,439
Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 45,698 32,546
Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 90 years  
Electric—generation    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 27,193 25,615
Electric—generation | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 3 years  
Electric—generation | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 56 years  
Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,642 3,864
Gas Distribution Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Gas Distribution Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 90 years  
Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,312 1,149
Common—electric and gas | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 4 years  
Common—electric and gas | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 50 years  
Nuclear Fuel    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [2] $ 6,546 6,384
Nuclear Fuel | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 1 year  
Nuclear Fuel | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 8 years  
Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,306 3,075
Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [3] $ 1,027 1,181
Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 3 years  
Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 50 years  
Exelon Generation Co L L C [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 36,147 34,482
Less: accumulated depreciation [4] 10,562 8,639
Property, plant and equipment, net 25,585 25,843
Nuclear fuel - work in progress 1,326 1,266
Capital Leases, Balance Sheet, Assets by Major Class, Net 10 13
Capital Leased Assets, Gross 52  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 42 39
Capitalized Costs, Oil and Gas Producing Activities, Net   266
Property, Plant, and Equipment, Fair Value Disclosure 17 146
Exelon Generation Co L L C [Member] | Electric—generation    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 27,193 25,615
Exelon Generation Co L L C [Member] | Electric—generation | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 3 years  
Exelon Generation Co L L C [Member] | Electric—generation | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 56 years  
Exelon Generation Co L L C [Member] | Nuclear Fuel    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [5] $ 6,546 6,384
Less: accumulated depreciation $ 3,186 2,861
Exelon Generation Co L L C [Member] | Nuclear Fuel | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 1 year  
Exelon Generation Co L L C [Member] | Nuclear Fuel | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 8 years  
Exelon Generation Co L L C [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 2,332 2,017
Exelon Generation Co L L C [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [6] $ 76 466
Average Service Life (years) 4 years  
Commonwealth Edison Co [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 23,272 21,212
Less: accumulated depreciation 3,937 3,710
Property, plant and equipment, net 19,335 17,502
Capital Leases, Balance Sheet, Assets by Major Class, Net 7  
Capital Leased Assets, Gross 8  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 1  
Plant Held for Future Use Amount 60  
Commonwealth Edison Co [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 22,636 20,576
Commonwealth Edison Co [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Commonwealth Edison Co [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 80 years  
Commonwealth Edison Co [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 569 572
Commonwealth Edison Co [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [7],[8] $ 67 64
Commonwealth Edison Co [Member] | Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 37 years  
Commonwealth Edison Co [Member] | Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 50 years  
PECO Energy Co [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 10,818 10,242
Less: accumulated depreciation 3,253 3,101
Property, plant and equipment, net 7,565 7,141
Plant Held for Future Use Amount 21  
PECO Energy Co [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 7,591 7,230
PECO Energy Co [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
PECO Energy Co [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 65 years  
PECO Energy Co [Member] | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 2,348 2,206
PECO Energy Co [Member] | Gas Distribution Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
PECO Energy Co [Member] | Gas Distribution Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 70 years  
PECO Energy Co [Member] | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 670 631
PECO Energy Co [Member] | Common—electric and gas | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
PECO Energy Co [Member] | Common—electric and gas | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 50 years  
PECO Energy Co [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 188 154
PECO Energy Co [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [9] $ 21 21
Average Service Life (years) 50 years  
Baltimore Gas and Electric Company [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 10,294 9,613
Less: accumulated depreciation 3,254 3,016
Property, plant and equipment, net 7,040 6,597
Plant Held for Future Use Amount 32  
Baltimore Gas and Electric Company [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 7,067 6,663
Baltimore Gas and Electric Company [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Baltimore Gas and Electric Company [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 90 years  
Baltimore Gas and Electric Company [Member] | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 2,170 1,951
Baltimore Gas and Electric Company [Member] | Gas Distribution Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Baltimore Gas and Electric Company [Member] | Gas Distribution Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 90 years  
Baltimore Gas and Electric Company [Member] | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 707 655
Baltimore Gas and Electric Company [Member] | Common—electric and gas | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Baltimore Gas and Electric Company [Member] | Common—electric and gas | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 40 years  
Baltimore Gas and Electric Company [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 318 312
Baltimore Gas and Electric Company [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [10] $ 32 32
Average Service Life (years) 20 years  
Pepco Holdings LLC [Member] | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 11,793  
Less: accumulated depreciation 195  
Property, plant and equipment, net 11,598  
Pepco Holdings LLC [Member] | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   16,204
Less: accumulated depreciation   5,340
Property, plant and equipment, net   10,864
Pepco Holdings LLC [Member] | Electric—transmission and distribution | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 10,315  
Pepco Holdings LLC [Member] | Electric—transmission and distribution | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   14,563
Pepco Holdings LLC [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Pepco Holdings LLC [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 86 years  
Pepco Holdings LLC [Member] | Gas Distribution Equipment | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 414  
Pepco Holdings LLC [Member] | Gas Distribution Equipment | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   547
Pepco Holdings LLC [Member] | Gas Distribution Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Pepco Holdings LLC [Member] | Gas Distribution Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 75 years  
Pepco Holdings LLC [Member] | Common—electric and gas | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 65  
Pepco Holdings LLC [Member] | Common—electric and gas | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   164
Pepco Holdings LLC [Member] | Common—electric and gas | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 4 years  
Pepco Holdings LLC [Member] | Common—electric and gas | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 40 years  
Pepco Holdings LLC [Member] | Construction work in progress | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 892  
Pepco Holdings LLC [Member] | Construction work in progress | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment   591
Pepco Holdings LLC [Member] | Other Property Plant and Equipment | Successor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [11] $ 107  
Pepco Holdings LLC [Member] | Other Property Plant and Equipment | Predecessor [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [11]   339
Pepco Holdings LLC [Member] | Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 3 years  
Pepco Holdings LLC [Member] | Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 43 years  
Potomac Electric Power Company [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 8,621 8,091
Less: accumulated depreciation 3,050 2,929
Property, plant and equipment, net 5,571 5,162
Plant Held for Future Use Amount 66  
Potomac Electric Power Company [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 8,018 7,682
Potomac Electric Power Company [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Potomac Electric Power Company [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 86 years  
Potomac Electric Power Company [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 537 318
Potomac Electric Power Company [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [12] $ 66 91
Potomac Electric Power Company [Member] | Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 10 years  
Potomac Electric Power Company [Member] | Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 33 years  
Delmarva Power and Light Company [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,448 4,209
Less: accumulated depreciation 1,175 1,139
Property, plant and equipment, net 3,273 3,070
Plant Held for Future Use Amount 16  
Delmarva Power and Light Company [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 3,574 3,431
Delmarva Power and Light Company [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Delmarva Power and Light Company [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 68 years  
Delmarva Power and Light Company [Member] | Gas Distribution Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 580 547
Delmarva Power and Light Company [Member] | Gas Distribution Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Delmarva Power and Light Company [Member] | Gas Distribution Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 75 years  
Delmarva Power and Light Company [Member] | Common—electric and gas    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 115 108
Delmarva Power and Light Company [Member] | Common—electric and gas | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 4 years  
Delmarva Power and Light Company [Member] | Common—electric and gas | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 40 years  
Delmarva Power and Light Company [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 163 107
Delmarva Power and Light Company [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [13] $ 16 16
Delmarva Power and Light Company [Member] | Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 10 years  
Delmarva Power and Light Company [Member] | Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 43 years  
Atlantic City Electric Company [Member]    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 3,537 3,291
Less: accumulated depreciation 1,016 969
Property, plant and equipment, net 2,521 2,322
Plant Held for Future Use Amount 27  
Atlantic City Electric Company [Member] | Electric—transmission and distribution    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 3,341 3,105
Atlantic City Electric Company [Member] | Electric—transmission and distribution | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 5 years  
Atlantic City Electric Company [Member] | Electric—transmission and distribution | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 55 years  
Atlantic City Electric Company [Member] | Construction work in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 169 158
Atlantic City Electric Company [Member] | Other Property Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [14] $ 27 $ 28
Atlantic City Electric Company [Member] | Other Property Plant and Equipment | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 13 years  
Atlantic City Electric Company [Member] | Other Property Plant and Equipment | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Average Service Life (years) 15 years  
[1] Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $3,186 million and $2,861 million as of December 31, 2016 and 2015, respectively
[2] Includes nuclear fuel that is in the fabrication and installation phase of $1,326 million and $1,266 million at December 31, 2016 and 2015, respectively.
[3] Includes Generation’s buildings under capital lease with a net carrying value of $10 million and $13 million at December 31, 2016 and 2015, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $42 million and $39 million, as of December 31, 2016 and 2015, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at both December 31, 2016 and 2015, of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2016 and 2015. Includes land held for future use and non utility property at ComEd, PECO, BGE, Pepco, DPL, and ACE of $60 million, $21 million, $32 million, $66 million, $16 million, and $27 million, respectively, at December 31, 2016. At December 31, 2015 these balances also include capitalized acquisition, development and exploration costs of $266 million related to oil and gas production activities at Generation, see Note 4—Mergers, Acquisitions, and Dispositions for additional information regarding the sale of upstream assets. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $17 million and $146 million at December 31, 2016 and 2015, respectively.
[4] Includes accumulated amortization of nuclear fuel in the reactor core of $3,186 million and $2,861 million as of December 31, 2016 and 2015, respectively
[5] Includes nuclear fuel that is in the fabrication and installation phase of $1,326 million and $1,266 million at December 31, 2016 and 2015, respectively
[6] Includes buildings under capital lease with a net carrying value of $10 million and $13 million at December 31, 2016 and 2015, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $42 million and $39 million, as of December 31, 2016 and 2015, respectively. At December 31, 2015 these balances also include capitalized acquisition, development and exploration costs of $266 million related to oil and gas production activities at Generation, see Note 4—Mergers, Acquisitions, and Dispositions for additional information regarding the sale of upstream assets. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $17 million and $146 million at December 31, 2016 and 2015, respectively.
[7] Includes buildings under capital lease with a net carrying value at both December 31, 2016 and 2015 of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2016 and 2015
[8] Includes land held for future use and non-utility property.
[9] Represents land held for future use and non-utility property.
[10] Represents land held for future use and non-utility property
[11] Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
[12] Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
[13] Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
[14] Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.