Impairment of Long-Lived assets (Tables) (Exelon Generation Co L L C [Member])

9 Months Ended

Sep. 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]

	September 30, 2013		December 31, 2012
Estimated residual value of leased assets	$	1,465	$	1,492
Less: unearned income		774		807
Net investment in long-term leases	$	691	$	685