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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2013
Income Taxes [Line Items]  
Effective Income Tax Rate Reconciliation
For the Three Months Ended June 30, 2013Exelon Generation ComEd  PECO  BGE
                
U.S. Federal statutory rate 35.0%  35.0%  35.0%  35.0% 35.0%
Increase (decrease) due to:              
 State income taxes, net of Federal income tax benefit4.1  3.5  5.6  2.9  5.6 
 Qualified nuclear decommissioning trust fund income(1.8)  (2.7)  0.0  0.0  0.0 
 Domestic production activities deduction0.1  0.2  0.0  0.0  0.0 
 Tax exempt income(0.1)  (0.2)  0.0  0.0  0.0 
 Health care reform legislation0.1  0.0  0.4  0.0  (0.3) 
 Amortization of investment tax credit, net deferred taxes(1.8)  (2.5)  (0.3)  (0.1)  (0.6) 
 Plant basis differences(1.4)  0.0  (0.4)  (8.6)  (0.7) 
 Production tax credits and other credits(1.4)  (2.2)  0.0  0.0  0.0 
 Other(0.3)  0.1  0.4  (0.1)  0.0 
                
Effective income tax rate32.5% 31.2% 40.7% 29.1% 39.0%
                
For the Six Months Ended June 30, 2013Exelon Generation ComEd  PECO  BGE
                
U.S. Federal statutory rate 35.0%  35.0%  35.0%  35.0%  35.0%
Increase (decrease) due to:              
 State income taxes, net of Federal income tax benefit8.6  0.4  4.1  2.9  5.7 
 Qualified nuclear decommissioning trust fund income2.8  4.8  0.0  0.0  0.0 
 Domestic production activities deduction0.0  (0.1)  0.0  0.0  0.0 
 Tax exempt income(0.2)  (0.4)  0.0  0.0  0.0 
 Health care reform legislation0.2  0.0  5.7  0.0  0.2 
 Amortization of investment tax credit, net deferred taxes(3.5)  (5.6)  (4.9)  (0.1)  (0.3) 
 Plant basis differences(3.1)  0.0  (8.7)  (7.5)  (0.6) 
 Production tax credits and other credits(2.8)  (4.9)  (0.3)  0.0  0.0 
 Other0.1  3.1  5.5  0.0  (0.2) 
                
Effective income tax rate37.1% 32.3% 36.4% 30.3% 39.8%

                
For the Three Months Ended June 30, 2012Exelon(a)  Generation(a) ComEd  PECO  BGE (b)
                
U.S. Federal statutory rate35.0% 35.0% 35.0% 35.0% 35.0%
Increase (decrease) due to:              
 State income taxes, net of Federal income tax benefit3.5  2.3  5.2  3.1  6.2 
 Qualified nuclear decommissioning trust fund income(2.0)  (3.8)  0.0  0.0  0.0 
 Domestic production activities deduction0.7  1.6  0.0  0.0  0.0 
 Tax exempt income(0.4)  (0.8)  0.0  0.0  0.0 
 Health care reform legislation0.3  0.0  1.0  0.0  2.7 
 Amortization of investment tax credit, net deferred taxes(0.7)  (0.7)  (0.8)  (0.3)  (1.7) 
 Plant basis differences(0.7)  0.0  0.1  (3.6)  (4.7) 
 Production tax credits and other credits(2.2)  (4.0)  0.0  0.0  0.0 
 Merger expenses (c)(0.8)  0.0  0.0  0.0  0.0 
 Other(2.3)  (3.6)  0.3  0.2  (1.5) 
                
Effective income tax rate30.4% 26.0% 40.8% 34.4% 36.0%
                
For the Six Months Ended June 30, 2012Exelon(a)  Generation(a) ComEd  PECO  BGE (b)
                
U.S. Federal statutory rate35.0% 35.0% 35.0% 35.0% 35.0%
Increase (decrease) due to:              
 State income taxes, net of Federal income tax benefit(10.7)  1.6  5.7  3.3  2.3 
 Qualified nuclear decommissioning trust fund income6.3  8.0  0.0  0.0  0.0 
 Domestic production activities deduction(0.2)  (0.2)  0.0  0.0  0.0 
 Tax exempt income(0.4)  (0.5)  0.0  0.0  0.0 
 Health care reform legislation0.2  0.0  0.6  0.0  (3.1) 
 Amortization of investment tax credit, net deferred taxes(0.7)  (0.6)  (0.5)  (0.3)  3.8 
 Plant basis differences(0.6)  0.0  0.0  (3.6)  10.6 
 Production tax credits and other credits(2.6)  (3.4)  0.0  0.0  0.0 
 Fines and Penalties6.1  7.6  0.0  0.0  0.0 
 Merger expenses (c)5.6  0.0  0.0  0.0  (18.3) 
 Other(1.3)  (1.0)  0.3  0.0  3.0 
                
Effective income tax rate36.7% 46.5% 41.1% 34.4% 33.3%

              

(a) Exelon activity for the three and six months ended June 30, 2012 includes the results of Constellation and BGE for March 12, 2012 - June 30, 2012. Generation activity for the three and six months ended June 30, 2012 includes the results of Constellation for March 12, 2012 - June 30, 2012.

(b)       BGE activity represents the activity for the three and six months ended June 30, 2012. BGE recognized a loss before income taxes for the six months ended June 30, 2012. As a result, positive percentages represent an income tax benefit for BGE for the six months ended June 30, 2012.

(c)       Prior to the close of the merger, the Registrants recorded the applicable taxes on merger transaction costs assuming the merger would not be completed. Upon closing of the merger, the Registrants reversed such taxes for those merger transaction costs that were determined to be non tax-deductible upon successful completion of a merger.