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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Stock-Based Compensation Plans [Line Items]  
Stock Based Compensation Components [Text Block]
  Three Months Ended Nine Months Ended
  September 30, September 30,
             
Components of Stock-Based Compensation Expense2013 2012 2013 2012
             
Performance share awards$ 12 $ 5 $ 41 $ 32
Stock options  1   2   3   13
Restricted stock units  13   12   49   41
Other stock-based awards  1   1   4   3
             
Total stock-based compensation expense included in            
 operating and maintenance expense  27   20   97   89
             
Income tax benefit (10)  (8)  (37)  (34)
             
Total after-tax stock-based compensation expense$ 17 $ 12 $ 60 $ 55
Stock Based Compensation Expense Subsidiaries [Text Block]
 Three Months Ended Nine Months Ended
 September 30, September 30,
            
Subsidiaries2013 2012 2013 2012
            
Generation$10 $9 $38 $33
ComEd 3  2  7  9
PECO 1  1  4  4
BGE (a) 1  1  5  4
BSC (b) 12  7  43  39
            
Total (c) $27 $20 $97 $89

       

(a)        BGE's stock-based compensation expense (pre-tax) for the nine months ended September 30, 2012 excludes $2 million of cost incurred in 2012 prior to the closing of Exelon's merger with Constellation on March 12, 2012. This amount is not included in Exelon's stock-based compensation expense for the nine months ended September 30, 2012 shown in the tables titled Components of Stock-Based Compensation Expense and Subsidiaries above.

(b)       These amounts primarily represent amounts billed to Exelon's subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO and BGE amounts above.

(c)       The stock-based compensation expense (pre-tax) for the three and nine months ended September 30, 2013 reflects the impact of changes to the retirement eligibility requirements for employees participating in the LTIP. In addition, the stock-based compensation expense at ComEd reflects the adoption of the ComEd Key Manager Long-Term Performance Program in 2013 for certain employees, which is not considered stock-based compensation expense under the applicable authoritative guidance. In 2012, these employees participated in the Exelon Restricted Stock Award Program.