Investment in Constellation Energy Nuclear Group, LLC (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Equity Method Investments [Line Items]

Schedule of total equity in earnings of investment in CENG

	Year Ended			Period March 12,
	Ended December 31,			through December 31,
	2013		2012
Equity investment income	$	123	$	73
Amortization of basis difference in CENG		(114)		(172)
Total equity in earnings (losses) - CENG	$	9	$	(99)

Exelon Generation Co L L C [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of total equity in earnings of investment in CENG

	Year Ended			Period March 12,
	Ended December 31,			through December 31,
	2013		2012
Equity investment income	$	123	$	73
Amortization of basis difference in CENG		(114)		(172)
Total equity in earnings (losses) - CENG	$	9	$	(99)