Investment in Constellation Energy Nuclear Group, LLC (Tables)

3 Months Ended

Mar. 31, 2014

Schedule of Equity Method Investments [Line Items]

Schedule of total equity in earnings of investment in CENG

	Three Months			Three Months
	Ended March 31,			Ended March 31,
	2014		2013
Equity investment income	$	(2)	$	15
Amortization of basis difference in CENG		(17)		(27)
Total equity in earnings - CENG	$	(19)	$	(12)

Exelon Generation Co L L C [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of total equity in earnings of investment in CENG

	Three Months			Three Months
	Ended March 31,			Ended March 31,
	2014		2013
Equity investment income	$	(2)	$	15
Amortization of basis difference in CENG		(17)		(27)
Total equity in earnings - CENG	$	(19)	$	(12)