Investment in Constellation Energy Nuclear Group, LLC (Tables)

3 Months Ended

Mar. 31, 2013

Equity Method Investments and Joint Ventures Tables [Line Items]

Schedule of total equity in earnings of investment in CENG

	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)

Schedule of summarized income statement information for CENG

	Income/(Expense)		Income/(Expense)			Accounts
	Three Months		For the Period		Income	Receivable/
	Ended		March 12 through		Statement	(Accounts Payable)
Agreement	March 31, 2013		March 31, 2012		Classification	At March 31, 2013
PPA	$	(248)	$	(35)	Purchased power and fuel	$	(70)
PSAA		1		1	Operating revenues		-
SSA		11		3	Operating revenues		4

Exelon Generation Co L L C [Member]

Equity Method Investments and Joint Ventures Tables [Line Items]

Schedule of total equity in earnings of investment in CENG

	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)

Schedule of summarized income statement information for CENG

	Income/(Expense)		Income/(Expense)			Accounts
	Three Months		For the Period		Income	Receivable/
	Ended		March 12 through		Statement	(Accounts Payable)
Agreement	March 31, 2013		March 31, 2012		Classification	At March 31, 2013
PPA	$	(248)	$	(35)	Purchased power and fuel	$	(70)
PSAA		1		1	Operating revenues		-
SSA		11		3	Operating revenues		4