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Jointly Owned Electric Utility Plant (Exelon, Generation, PECO and BGE)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jointly Owned Utility Plant Interests [Line Items]    
Jointly Owned Electric Utility Plant (Exelon, Generation, PECO and BGE)
  Nuclear generation  Fossil fuel generation  Transmission  Other  
                                     
      Peach                            
  Quad Cities  Bottom  Salem (a)  Keystone (b) Conemaugh (b) Wyman  PA (c)  DE/NJ (d)  Other (e) 
                                     
OperatorGeneration Generation PSEG Nuclear GenOn GenOn FP&L First Energy PSEG    
Ownership interest 75.00%  50.00%  42.59%  41.98%  31.28%  5.89% Various   42.55%  44.24%
                                     
Exelon’s share at                                    
 December 31, 2013:                                   
Plant (f)$ 941  $ 883  $ 501  $ 725  $ 399  $ 3  $ 14  $ 64  $ 2 
Accumulated                                   
 depreciation (f)  226    326    134    268    220    3    7    34    1 
Construction                                   
 work in progress  27    174    24    6    121    —    —    —    — 
                                     
Exelon’s share at                                    
 December 31, 2012:                                   
Plant (f)$ 874  $ 796  $ 494  $ 624  $ 322  $ 3  $ 13  $ 65  $ 1 
Accumulated                                   
 depreciation (f)  187    302    119    153    158    3    7    33    — 
Construction                                   
 work in progress  44    115    11    10    57    —    1    —    — 

9. Jointly Owned Electric Utility Plant (Exelon, Generation, PECO and BGE)

 

Exelon, Generation, PECO and BGE's undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2013 and 2012 were as follows: