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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2012
Common Stock Disclosure Tables [Abstract]  
Stock Based Compensation Components [Text Block]
  Year Ended
  December 31,
          
Components of Stock-Based Compensation Expense2012 2011 2010
          
Performance share awards$ 46 $ 26 $ 6
Stock options  15   8   10
Restricted stock units  50   31   21
Other stock-based awards  4   4   4
          
Total stock-based compensation expense included in         
 operating and maintenance expense  115   69   41
          
Income tax benefit  (44)   (27)   (16)
          
Total after-tax stock-based compensation expense$ 71 $ 42 $ 25
Stock Based Compensation Expense Subsidiaries [Text Block]
 Year Ended
 December 31,
          
Subsidiaries2012(a) 2011 2010
          
Generation$ 42  $ 31 $ 21
ComEd  11    5   3
PECO  5    5   3
BGE   5    6   4
BSC (b)  52    28   14
          
Total$ 115  $ 69 $ 41

 

(a)        For BGE, reflects BGE's stock-based compensation expense for the year ended December 31, 2012. For Exelon and Generation, includes the stock-based compensation expense of Constellation and BGE from the date of the merger, March 12, 2012, through December 31, 2012.

(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.

 
Stock Based Compensation Tax Benefit [Text Block]
   Year Ended
   December 31,
           
 2012 2011 2010
Realized tax benefit when exercised/distributed:        
           
  Stock options$ 3 $ 2 $ 5
  Restricted stock units  11   8   9
  Performance share awards  7   7   13
  Stock deferral plan  —   1   1
           
Excess tax benefits included in other financing activities of Exelon’s         
 Consolidated Statements of Cash Flows:        
  Stock options$2 $1 $3
Weighted Average Assumptions And Grand Date Fair Value Of Stock Options [Text Block]
 Year Ended December 31, 
            
 2012  2011  2010 
            
Dividend yield  5.28%   4.84%   4.56%
Expected volatility  23.20%   24.40%   27.10%
Risk-free interest rate  1.30%   2.65%   2.96%
Expected life (years)  6.25    6.25    6.25 
Weighted average grant date fair value (per share)$ 4.18  $ 6.22  $ 8.08 
Stock Option Activity [Text Block]
    Weighted Weighted   
    Average Average   
    Exercise Remaining   
    Price Contractual Aggregate
    (per Life Intrinsic
  Shares  share)  (years)  Value
           
Balance of shares outstanding at December 31, 2011 11,553,761 $ 48.49     
Options granted 2,372,000   39.66     
Converted Constellation options 11,194,151   41.35     
Options exercised (1,776,041)   26.41     
Options forfeited (980,986)   42.90     
Options expired (459,104)   49.45     
           
Balance of shares outstanding at December 31, 2012 21,903,781 $ 45.91  5.58 $ 13
           
Exercisable at December 31, 2012 (a) 19,943,116 $ 46.40  5.25 $ 13

 

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

 
Stock Options Exercised [Text Block]
 Year Ended
 December 31,
         
 2012 2011 2010
         
Intrinsic value (a)$ 19 $ 5 $ 13
Cash received for exercise price  47   13   24

 

(a)       The difference between the market value on the date of exercise and the option exercise price.

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) 2,372,000   39.66
Converted Constellation options 11,194,151   41.35
Vested (b)(c) (12,023,432)   41.37
Forfeited (459,104)   49.45
     
Nonvested at December 31, 2012 (a) 1,960,665 $ 40.56

 

(a)       Excludes 2,647,536 and 1,348,000 of stock options issued to retirement-eligible employees as of December 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 1,699,000 of stock options issued to retirement-eligible employees in 2012 that vested immediately upon the employee reaching retirement eligibility.

 
Non Vested Restricted Stock [Text Block]
    
   Weighted Average
   Grant Date Fair
 Shares  Value (per share)
     
Nonvested at December 31, 2011 (a) 1,074,484 $ 48.08
Granted 1,332,214   39.94
Converted Constellation restricted stock 825,735   38.91
Vested (479,805)   46.36
Forfeited (76,484)   42.21
Undistributed vested awards (b) (646,983)   40.75
     
Nonvested at December 31, 2012 (a) 2,029,161 $ 42.12

 

(a)       Excludes 686,121 and 448,827 of restricted stock units issued to retirement-eligible employees as of December 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 1,429,189   39.72
Vested (167,048)   47.46
Forfeited (116,388)   39.78
Undistributed vested awards (b) (179,867)   40.72
     
Nonvested at December 31, 2012 (a) 1,312,734 $ 40.08

 

(a)       Excludes 204,643 and 455,418 of performance share awards issued to retirement-eligible employees as of December 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.

 
Not Settled Performance Share Awards Balance Sheet Presentation [Text Block]
      
 December 31,
      
 2012 2011
      
Current liabilities (a)$ 7 $ 3
Deferred credits and other liabilities (b)  11   —
Common stock  35   30
      
Total$ 53 $ 33

 

(a)       Represents the current liability related to performance share awards expected to be settled in cash.

(b)       Represents the long-term liability related to performance share awards expected to be settled in cash.