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Quarterly Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data [Line Items]  
Quarterly Financial Information Table [Text Block]
             Net Income
             on Common
 Operating Revenues  Operating Income  Stock
 2012 2011 2012 2011 2012 2011
Quarter ended:                 
March 31$ 4,686 $ 4,956 $ 359 $ 1,202 $ 200 $ 668
June 30  5,954   4,496   714   1,034   286   620
September 30  6,565   5,254   603   1,181   296   601
December 31  6,284   4,357   704   1,062   378   606
Average Basic And Diluted Shares And Net Income Per Basic And Diluted Share [Text Block]
 Average Basic Shares      
 Outstanding Net Income
 (in millions) per Basic Share
 2012 2011 2012 2011
Quarter ended:           
March 31  705   662 $ 0.28 $ 1.01
June 30  853   663   0.34   0.93
September 30  854   663   0.35   0.91
December 31  854   664   0.44   0.91
            
 Average Diluted Shares      
 Outstanding Net Income
 (in millions) per Diluted Share
 2012 2011 2012 2011
Quarter ended:           
March 31  707   664 $ 0.28 $ 1.01
June 30  856   664   0.33   0.93
September 30  857   665   0.35   0.90
December 31  857   666   0.44   0.91
Per Share Information [Text Block]
  2012 2011
                    
  FourthThirdSecondFirst Fourth ThirdSecondFirst
  Quarter Quarter Quarter Quarter  Quarter  Quarter Quarter Quarter
                    
High price$ 37.50$ 39.82$ 39.37$ 43.70 $ 45.45 $ 45.27$ 42.89$ 43.58
Low price  28.40  34.54  36.27  38.31   39.93   39.51  39.53  39.06
Close  29.74  35.58  37.62  39.21   43.37   42.61  42.84  41.24
Dividends  0.525  0.525  0.525  0.525   0.525(a)  0.525  0.525  0.525

(a)       The fourth quarter 2011 dividend does not include the first quarter 2012 regular quarterly dividend of $0.525 per share, declared by the Exelon Board of Directors on October 25, 2011. The first quarter 2012 dividend is payable on March 9, 2012, to shareholders of record of Exelon at the end of the day on February 15, 2012.

 
Exelon Generation Co L L C [Member]
  
Quarterly Financial Data [Line Items]  
Quarterly Financial Information Table [Text Block]
             Net Income
             on Membership
 Operating Revenues  Operating Income  Interest
 2012 2011 2012 2011 2012 2011
Quarter ended:                 
March 31$ 2,739 $ 2,643 $ 272 $ 801 $ 168 $ 495
June 30  3,753   2,455   384   647   166   443
September 30  4,017   2,821   174   754   91   386
December 31  3,928   2,528   290   673   137   447
Commonwealth Edison Co [Member]
  
Quarterly Financial Data [Line Items]  
Quarterly Financial Information Table [Text Block]
 Operating Revenues  Operating Income  Net Income
 2012 2011 2012 2011 2012 2011
Quarter ended:                 
March 31$ 1,388 $ 1,466 $ 226 $ 200 $ 87 $ 69
June 30  1,281   1,444   142   254   42   114
September 30  1,484   1,784   218   243   90   112
December 31  1,290   1,362   300   285   160   121
PECO Energy Co [Member]
  
Quarterly Financial Data [Line Items]  
Quarterly Financial Information Table [Text Block]
             Net Income
             on Common
 Operating Revenues  Operating Income  Stock
 2012 2011 2012 2011 2012 2011
Quarter ended:                 
March 31$ 875 $ 1,153 $ 177 $ 210 $ 96 $ 125
June 30  715   842   151   161   79   82
September 30  806   946   178   153   122   104
December 31  790   778   117   131   79   73
Baltimore Gas and Electric Company [Member]
  
Quarterly Financial Data [Line Items]  
Quarterly Financial Information Table [Text Block]
             Net (Loss) Income
       Operating  on Common
 Operating Revenues  (Loss) Income Stock
 2012 2011 2012 2011 2012 2011
Quarter ended:                 
March 31$ 696 $ 976 $ (11) $ 153 $ (33) $ 78
June 30  616   674   52   54   13   13
September 30  720   745   30   23   (4)   (2)
December 31  703   673   61   84   15   34