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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Common Stock Disclosure Tables [Abstract]  
Stock Based Compensation Components [Text Block]
  Three Months Ended
  March 31,
       
Components of Stock-Based Compensation Expense2012 2011
       
Performance share awards$ 16 $ 6
Stock options  7   5
Restricted stock units  19   16
Other stock-based awards  1   1
       
Total stock-based compensation expense included in      
 operating and maintenance expense  43   28
       
Income tax benefit (16)  (11)
       
Total after-tax stock-based compensation expense$ 27 $ 17
Stock Based Compensation Expense Subsidiaries [Text Block]
 Three Months Ended
 March 31,
      
Subsidiaries2012 2011
      
Generation$ 14 $ 13
ComEd  5   2
PECO  3   2
BGE (a)  2  0
BSC (b)  19   11
      
Total$ 43 $ 28

       

(a)       BGE's stock-based compensation expense (pre-tax) for the three months ended March 31, 2012 includes $2 million of cost incurred 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 three months ended March 31, 2012 shown in the table titled Components of Stock-Based Compensation Expense above. BGE's stock-based compensation expense (pre-tax) for the three months ended March 31, 2011 was $2 million.

(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.

 
Weighted Average Assumptions And Grand Date Fair Value Of Stock Options [Text Block]
 Three Months Ended
        
 2012 2011
        
Dividend yield  5.28%   4.84%
Expected volatility  23.20%   24.40%
Risk-free interest rate  1.30%   2.65%
Expected life (years)  6.25    6.25 
Stock Option Activity [Text Block]
    Weighted Average
    Exercise Price
  Shares   (per share)
      
Balance of shares outstanding at December 31, 2011 11,553,761 $ 48.49
Granted 1,840,000   39.79
Converted Constellation options 11,194,151   41.35
Exercised (237,490)   25.29
Forfeited (4,625)   53.51
Expired (70,098)   45.28
      
Balance of shares outstanding at March 31, 2012 24,275,699 $ 44.78
      
Exercisable at March 31, 2012 (a) 21,404,105 $ 45.33

       

(a)       Includes stock options issued to retirement eligible employees.

 
Non Vested Stock Option [Text Block]
     
   Weighted Average
   Exercise Price
 Shares  (per share)
     
Nonvested at December 31, 2011 (a) 877,050 $ 48.66
Granted (b) 1,840,000   39.79
Converted Constellation options 11,194,151   41.35
Vested (b) (c) (10,969,509)   41.85
Forfeited (70,098)   45.28
     
Nonvested at March 31, 2012 (a) 2,871,594 $ 40.58
Non Vested Restricted Stock [Text Block]

       

(a)       Excludes 2,141,000 and 1,348,000 of stock options issued to retirement-eligible employees as of March 31, 2012 and December 31, 2011, respectively, as they are fully vested.

(b)       Includes 8,684,709 of converted Constellation options that were vested prior to the Merger on March 12, 2012.

(c)       Includes 1,013,000 of stock options issued to retirement-eligible employees in 2012 that vested immediately upon the employee reaching retirement eligibility.

 

    
   Weighted Average
   Grant Date Fair
 Shares  Value (per share)
     
Nonvested at December 31, 2011 (a) 1,074,484 $ 48.08
Granted 1,035,280   39.81
Converted Constellation restricted stock 825,735   38.91
Vested (292,923)   47.71
Forfeited (10,784)   44.63
Undistributed vested awards (b) (518,064)   39.68
     
Nonvested at March 31, 2012 (a) 2,113,728 $ 42.57

       

(a)       Excludes 610,398 and 448,827 of restricted stock units issued to retirement-eligible employees as of March 31, 2012 and December 31, 2011, respectively, as they are fully vested

(b)       Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2012.

 
Non Vested Performance Shares [Text Block]
    
   Weighted Average
   Grant Date Fair
 Shares  Value (per share)
     
Nonvested at December 31, 2011 (a) 346,848 $ 45.37
Granted 1,036,603   39.84
Vested (151,700)   47.87
Forfeited (2,183)   43.40
Undistributed vested awards (b) (172,991)   40.37
     
Nonvested at March 31, 2012 (a) 1,056,577 $ 40.41

       

(a)       Excludes 274,813 and 455,418 of performance share awards issued to retirement-eligible employees as of March 31, 2012 and December 31, 2011, respectively, as they are fully vested.

(b)       Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2012.