Debt and Credit Agreements Year-End (Tables)

3 Months Ended

Mar. 31, 2012

Debt Tables [Line Items]

Schedule Of Short Term Debt [Text Block]

Type of Credit Facility		Amount (a)		Expiration Dates	Capacity Type
Exelon Corporate		(In billions)
	Syndicated Revolver	$	2.00	October 2013 to March 2016	Letters of credit and cash
	Bilateral		1.56	September 2013 to December 2014	Letters of credit and cash
Generation
	Syndicated Revolver		5.30	March 2016	Letters of credit and cash
	Bilateral		0.30	December 2015 and March 2016	Letters of credit and cash
ComEd
	Syndicated Revolver		1.00	March 2017	Letters of credit and cash
PECO
	Syndicated Revolver		0.60	March 2016	Letters of credit and cash
BGE
	Syndicated Revolver		0.60	March 2015	Letters of credit and cash
	Total	$	11.36

Schedule Of Short Term Borrowing Activity [Text Block]

Commercial Paper Borrowings	March 31, 2012		December 31, 2011
Exelon Corporate	$	0	$	161
Generation		0		0
ComEd		302		0
PECO		0		0
BGE		0		0