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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2012
Retirement Benefits Tables [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Text Block]
    Pension Benefits  Other Postretirement Benefits
    Three Months Ended  Three Months Ended
    June 30,  June 30,
    2012  2011  2012  2011
 Service cost$74 $53 $39 $35
 Interest cost 179  163  54  51
 Expected return on assets (253)  (234)  (29)  (28)
 Amortization of:           
  Transition obligation 0  0  2  3
  Prior service cost (benefit) 3  3  (3)  (10)
  Actuarial loss 115  82  19  17
 Contractual termination benefit cost (a) 14  0  6  0
 Curtailment gain 0  0  (2)  0
              
 Net periodic benefit cost$132 $67 $86 $68
              
    Pension Benefits  Other Postretirement Benefits
    Six Months Ended  Six Months Ended
    June 30,  June 30,
    2012  2011  2012  2011
 Service cost$135 $106 $76 $71
 Interest cost 343  325  104  103
 Expected return on assets (484)  (469)  (58)  (56)
 Amortization of:           
  Transition obligation 0  0  6  5
  Prior service cost (benefit) 7  7  (6)  (19)
  Actuarial loss 221  165  38  33
 Contractual termination benefit cost (a) 14  0  6  0
 Curtailment gain 0  0  (2)  0
              
 Net periodic benefit cost$236 $134 $164 $137

       

(a)       As discussed above, ComEd and BGE established regulatory assets of $1 million and $4 million, respectively, for their portion of the second quarter 2012 contractual termination benefit charge.

Schedule Of Pension And Other Postretirement Benefit Costs [Text Block]
    Three Months Ended Six Months Ended 
    June 30, June 30, 
  Pension and Postretirement Benefit Costs2012 2011 2012 2011 
  Generation$94 $61 $175 $123 
  ComEd 68  54  137  108 
  PECO  13  8  26  16 
  BGE (a)(b) 18  14  32  28 
  BSC (c) 25  12  42  24 

BGE's pension and postretirement benefit costs for the six months ended June 30, 2012 and 2011 include $12 million and $28 million, respectively, of costs incurred prior to the closing of Exelon's merger with Constellation on March 12, 2012. BGE's pension and postretirement benefit costs for the three months ended June 30, 2011 include $14 million of costs incurred prior to the closing of Exelon's merger with Constellation on March 12, 2012. These amounts are not included in Exelon's net periodic benefit costs for the three and six months ended June 30, 2012 and 2011 shown in the first table of the Defined Benefit Pension and Other Postretirement Benefits section above.

(b)       BGE's pension and other postretirement benefit costs for the three and six months ended June 30, 2012 includes a $3 million contractual termination benefit charge, which was recorded as a regulatory asset as of June 30, 2012.

(c)       These amounts primarily represent amounts billed to Exelon's subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO or BGE amounts above. As of June 30, 2012, ComEd and BGE each recorded a regulatory asset of $1 million related to their BSC-billed portion of the second quarter 2012 contractual termination benefit charge.

 
Schedule Of Defined Contributions [Text Block]
   Three Months Ended  Six Months Ended 
   June 30, June 30, 
 Savings Plan Matching Contributions2012 2011 2012 2011 
 Exelon$17 $15 $33 $34 
 Generation 8  8  15  18 
 ComEd 5  4  9  10 
 PECO 2  2  4  4 
 BGE (a) 2  2  4  4 
 BSC (b) 1  1  2  2 

  • BGE's matching contributions for the six months ended June 30, 2012 include $1 million of costs incurred prior to the closing of Exelon's merger with Constellation on March 12, 2012, which is not included in Exelon's matching contributions for the six months ended June 30, 2012.
  • These amounts primarily represent amounts billed to Exelon's subsidiaries through intercompany allocations. These costs are not included in the Generation, ComEd, PECO or BGE amounts above.