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Jointly Owned Electric Utility Plant (Tables)
 12 Months Ended
Dec. 31, 2012
Jointly Owned Utility Plant Net Ownership Amount Tables [Line Items]  
Schedule Of Jointly Owned Utility Plants Text Block
  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, 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    —    — 
                                     
Exelon’s share at                                    
 December 31, 2011:                                   
Plant (f)$ 822  $ 650  $ 420  $ 366  $ 271  $ 3  $ 5  $ 66  $ 1 
Accumulated                                   
 depreciation (f)  156    285    103    137    154    3    3    33    — 
Construction                                   
 work in progress  37    111    61    5    15    —    —    —    — 

 

(a)       Generation also owns a proportionate share in the fossil fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2012 and 2011.

(b)       Generation's ownership interest in Keystone and Conemaugh has increased as a result of Exelon's merger with Constellation in 2012. See Note 4 for additional information.

(c) PECO and BGE own a 22% and 7% share, respectively, in 127 miles of 500 kV lines located in Pennsylvania; PECO and BGE also own a 20.7% and 10.56% share, respectively, of a 500 kV substation immediately outside of the Conemaugh fossil generating station which supplies power to the 500 kV lines including, but not limited to, the lines noted above.

(d)       PECO owns a 42.55% share in 131 miles of 500 kV lines located in Delaware and New Jersey as well as a 42.55% share in a 500kV substation immediately outside of the Salem nuclear generating station in New Jersey which supplies power to the 500kV lines including, but not limited to, the lines noted above.

(e)       Generation has a 44.24% ownership interest in Merrill Creek Reservoir located in New Jersey.

(f)       Excludes asset retirement costs.

 
Exelon Generation Co L L C [Member]
  
Jointly Owned Utility Plant Net Ownership Amount Tables [Line Items]  
Schedule Of Jointly Owned Utility Plants Text Block
  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, 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    —    — 
                                     
Exelon’s share at                                    
 December 31, 2011:                                   
Plant (f)$ 822  $ 650  $ 420  $ 366  $ 271  $ 3  $ 5  $ 66  $ 1 
Accumulated                                   
 depreciation (f)  156    285    103    137    154    3    3    33    — 
Construction                                   
 work in progress  37    111    61    5    15    —    —    —    — 

 

(a)       Generation also owns a proportionate share in the fossil fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2012 and 2011.

(b)       Generation's ownership interest in Keystone and Conemaugh has increased as a result of Exelon's merger with Constellation in 2012. See Note 4 for additional information.

(c) PECO and BGE own a 22% and 7% share, respectively, in 127 miles of 500 kV lines located in Pennsylvania; PECO and BGE also own a 20.7% and 10.56% share, respectively, of a 500 kV substation immediately outside of the Conemaugh fossil generating station which supplies power to the 500 kV lines including, but not limited to, the lines noted above.

(d)       PECO owns a 42.55% share in 131 miles of 500 kV lines located in Delaware and New Jersey as well as a 42.55% share in a 500kV substation immediately outside of the Salem nuclear generating station in New Jersey which supplies power to the 500kV lines including, but not limited to, the lines noted above.

(e)       Generation has a 44.24% ownership interest in Merrill Creek Reservoir located in New Jersey.

(f)       Excludes asset retirement costs.

 
PECO Energy Co [Member]
  
Jointly Owned Utility Plant Net Ownership Amount Tables [Line Items]  
Schedule Of Jointly Owned Utility Plants Text Block
  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, 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    —    — 
                                     
Exelon’s share at                                    
 December 31, 2011:                                   
Plant (f)$ 822  $ 650  $ 420  $ 366  $ 271  $ 3  $ 5  $ 66  $ 1 
Accumulated                                   
 depreciation (f)  156    285    103    137    154    3    3    33    — 
Construction                                   
 work in progress  37    111    61    5    15    —    —    —    — 

 

(a)       Generation also owns a proportionate share in the fossil fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2012 and 2011.

(b)       Generation's ownership interest in Keystone and Conemaugh has increased as a result of Exelon's merger with Constellation in 2012. See Note 4 for additional information.

(c) PECO and BGE own a 22% and 7% share, respectively, in 127 miles of 500 kV lines located in Pennsylvania; PECO and BGE also own a 20.7% and 10.56% share, respectively, of a 500 kV substation immediately outside of the Conemaugh fossil generating station which supplies power to the 500 kV lines including, but not limited to, the lines noted above.

(d)       PECO owns a 42.55% share in 131 miles of 500 kV lines located in Delaware and New Jersey as well as a 42.55% share in a 500kV substation immediately outside of the Salem nuclear generating station in New Jersey which supplies power to the 500kV lines including, but not limited to, the lines noted above.

(e)       Generation has a 44.24% ownership interest in Merrill Creek Reservoir located in New Jersey.

(f)       Excludes asset retirement costs.