Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2013

Schedule Of Related Party Transactions By Related Party Tables [Line Items]

Schedule Of Income Loss From Equity Method Investments [Text Block]

	Three Months			For the Period March 12,
	Ended March 31,			through March 31,
	2013		2012
Equity investment income (loss)	$	15	$	(9)
Amortization of basis difference in CENG		(27)		(12)
Total equity in losses - CENG	$	(12)	$	(21)

Exelon Generation Co L L C [Member]

Schedule Of Related Party Transactions By Related Party Tables [Line Items]

Schedule Of Income Loss From Equity Method Investments [Text Block]

	Three Months			For the Period March 12,
	Ended March 31,			through March 31,
	2013		2012
Equity investment income (loss)	$	15	$	(9)
Amortization of basis difference in CENG		(27)		(12)
Total equity in losses - CENG	$	(12)	$	(21)