XML 114 R43.htm IDEA: XBRL DOCUMENT v2.4.0.6
Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Property Plant Equipment [Line Items]  
Schedule Of Property Plant And Equipment Table [Text Block]
  Average Service Life      
  (years)  2012 2011
Asset Category         
Electric—transmission and distribution5-90 $26,576 $21,716
Electric—generation (a)1-53  19,004  13,682
Gas—transportation and distribution5-90  3,108  1,793
Common—electric and gas5-50   1,029  564
Nuclear fuel (b)1-8  4,815  4,225
Construction work in progressN/A  1,926  1,110
Other property, plant and equipment (c)3-72  912  439
           
 Total property, plant and equipment     57,370  43,529
 Less: accumulated depreciation (d)     12,184  10,959
           
Property, plant and equipment, net    $45,186 $32,570

 

(a)       Includes assets acquired through acquisitions. See Note 4 – Mergers and Acquisitions for additional information.

(b)       Includes nuclear fuel that is in the fabrication and installation phase of $894 million and $674 million at December 31, 2012 and 2011, respectively.

(c)       Includes Generation's buildings under capital lease with a net carrying value of $20 million and $23 million at December 31, 2012 and 2011, respectively. The original cost basis of the buildings was $53 million and total accumulated amortization was $33 million and $30 million as of December 31, 2012 and 2011, respectively. Also includes land held for future use and non utility property at ComEd, PECO and BGE. These balances also include capitalized acquisition, development and exploration costs related to oil and gas production activities at Generation.

(d)       Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $2,078 million and $1,784 million as of December 31, 2012 and 2011, respectively.

 
Property Plant And Equipment Average Service Life Percentage By Asset Category Table [Text Block]
Average Service Life Percentage by Asset Category2012 2011 2010
         
Electric—transmission and distribution2.76% 2.59% 2.53%
Electric—generation3.15% 3.12% 2.86%
Gas2.03% 1.73% 1.75%
Common—electric and gas7.61% 8.05% 7.25%
Exelon Generation Co L L C [Member]
  
Property Plant Equipment [Line Items]  
Schedule Of Property Plant And Equipment Table [Text Block]
  Average Service Life      
  (years)  2012 2011
Asset Category         
Electric—generation (a)1-53 $19,004 $13,682
Nuclear fuel (b)1-8  4,815  4,225
Construction work in progressN/A  1,352  827
Other property, plant and equipment (c)5-57  374  54
           
 Total property, plant and equipment     25,545  18,788
 Less: accumulated depreciation (d)     6,014  5,313
           
Property, plant and equipment, net    $19,531 $13,475

(a)       Includes assets acquired through acquisitions. See Note 4 – Mergers and Acquisitions for additional information.

(b)       Includes nuclear fuel that is in the fabrication and installation phase of $894 million and $674 million at December 31, 2012 and 2011, respectively.

(c)       Includes buildings under capital lease with a net carrying value of $20 million and $23 million at December 31, 2012 and 2011, respectively. The original cost basis of the buildings was $53 million and total accumulated amortization was $33 million and $30 million as of December 31, 2012 and 2011, respectively.

(d)       Includes accumulated amortization of nuclear fuel in the reactor core of $2,078 million and $1,784 million as of December 31, 2012 and 2011, respectively.

 
Commonwealth Edison Co [Member]
  
Property Plant Equipment [Line Items]  
Schedule Of Property Plant And Equipment Table [Text Block]
  Average Service Life      
  (years)  2012 2011
Asset Category         
Electric—transmission and distribution5-75 $16,480 $15,637
Construction work in progressN/A  294  187
Other property, plant and equipment (a)72  50  47
           
 Total property, plant and equipment     16,824  15,871
 Less: accumulated depreciation     2,998  2,750
           
Property, plant and equipment, net    $13,826 $13,121

 

(a)       Represents land held for future use and non utility property.

 
PECO Energy Co [Member]
  
Property Plant Equipment [Line Items]  
Schedule Of Property Plant And Equipment Table [Text Block]
  Average Service Life      
  (years)  2012 2011
Asset Category         
Electric—transmission and distribution5-65 $6,355 $6,079
Gas—transportation and distribution5-70  1,859  1,793
Common—electric and gas5-50   568  564
Construction work in progressN/A  76  83
Other property, plant and equipment (a) 50    17  17
           
 Total property, plant and equipment     8,875  8,536
 Less: accumulated depreciation     2,797  2,662
           
Property, plant and equipment, net    $6,078 $5,874

  

(a)       Represents land held for future use and non utility property.

 
Property Plant And Equipment Average Service Life Percentage By Asset Category Table [Text Block]
Average Service Life Percentage by Asset Category2012  2011  2010 
         
Electric—transmission and distribution2.51% 2.33% 2.17%
Gas1.77% 1.73% 1.75%
Common—electric and gas7.54% 8.05% 7.25%
Baltimore Gas and Electric Company [Member]
  
Property Plant Equipment [Line Items]  
Schedule Of Property Plant And Equipment Table [Text Block]
  Average Service Life      
  (years)  2012 2011
Asset Category         
Electric—transmission and distribution5-90 $5,767 $5,483
Gas—transmission and distribution5-90  1,548  1,387
Common—electric and gas5-40  554  415
Construction work in progressN/A  193  298
Other property, plant and equipment (a)20  31  15
          
Total property, plant and equipment     8,093  7,598
Less: accumulated depreciation     2,595  2,466
          
Property, plant and equipment, net    $5,498 $5,132

 

(a)       Represents land held for future use and non utility property.

 
Property Plant And Equipment Average Service Life Percentage By Asset Category Table [Text Block]
Average Service Life Percentage by Asset Category2012  2011  2010 
         
Electric—transmission and distribution2.92% 2.89% 2.88%
Gas2.33% 2.41% 2.42%
Common—electric and gas7.68% 8.40% 7.24%