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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2013
Variable Interest Entity [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]
 December 31, 2013  December 31, 2012
  Exelon (a) Generation BGE Exelon (a)(b) Generation (b) BGE
Current assets$ 484 $ 446 $ 28 $ 550 $ 519 $ 30
Noncurrent assets  1,905   1,884   3   1,719   1,680   -
 Total assets$ 2,389 $ 2,330 $ 31 $ 2,269 $ 2,199 $ 30
                   
Current liabilities$ 566 $ 481 $ 74 $ 684 $ 612 $ 71
Noncurrent liabilities  774   562   195   775   470   265
 Total liabilities$ 1,340 $ 1,043 $ 269 $ 1,459 $ 1,082 $ 336
Schedule Of Unconsolidated Variable Interest Entities [Text Block]
        
  Commercial Equity   
  Agreement Investment   
December 31, 2013VIEs VIEs Total
Total assets (a)$128 $332 $460
Total liabilities (a) 17  123  140
Registrants' ownership interest (a) 0  86  86
Other ownership interests (a) 111  123  234
Registrants' maximum exposure to loss:        
 Carrying amount of equity investments 7  67  74
 Contract intangible asset 9  0  9
 Debt and payment guarantees 0  5  5
 Net assets pledged for Zion Station decommissioning (b) 44  0  44
          
        
  Commercial Equity   
  Agreement Investment   
December 31, 2012VIEs VIEs Total
Total assets (a)$386 $354 $740
Total liabilities (a) 219  114  333
Registrants' ownership interest (a) 0  97  97
Other ownership interests (a) 167  143  310
Registrants' maximum exposure to loss:        
 Letters of credit 5  0  5
 Carrying amount of equity investments 0  77  77
 Contract intangible asset 8  0  8
 Debt and payment guarantees 0  5  5
 Net assets pledged for Zion Station decommissioning (b) 50  0  50