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Basis of Presentation (Tables)
6 Months Ended
Jun. 30, 2012
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
 
Variable Interest Entity [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]
 June 30, 2012
  Exelon Generation BGE
Current assets$ 355 $ 333 $ 22
Noncurrent assets  446   403   -
 Total assets$ 801 $ 736 $ 22
          
Current liabilities$ 280 $ 210 $ 70
Noncurrent liabilities  553   212   299
 Total liabilities$ 833 $ 422 $ 369
         
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
 
Variable Interest Entity [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]
    Equity   
  Energy Method   
  Contract Investment   
June 30, 2012VIEs VIEs Total
Total assets (a)$283 $363 $646
Total liabilities (a) 220  116  336
Registrants' ownership interest (a) 0  98  98
Other ownership interests (a) 63  149  212
Registrants' maximum exposure to loss:        
 Letters of credit 11  0  11
 Carrying amount of equity method investments 0  77  77
 Debt and payment guarantees 0  5  5

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  • These items represent amounts on the unconsolidated VIE balance sheets, not on Exelon's or Generation's Consolidated Balance Sheets. These items are included to provide information regarding the relative size of the unconsolidated VIEs.