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Impairment of Long-Lived assets (Tables) (Exelon Generation Co L L C [Member])
6 Months Ended
Jun. 30, 2013
Exelon Generation Co L L C [Member]
 
Impaired Long-Lived Assets Held and Used [Line Items]  
Schedule of Capital Leased Assets [Table Text Block]
  June 30,   December 31,
  2013  2012
Estimated residual value of leased assets$ 1,465 $ 1,492
Less: unearned income  782   807
Net investment in long-term leases$ 683 $ 685