Debt and Credit Agreements Quarter-End (Tables)

12 Months Ended

Dec. 31, 2012

Debt Tables [Abstract]

Commercial paper and credit facility borrowings outstanding

	Maximum Program Size at December 31,				Outstanding Commercial Paper at December 31,				Average Interest Rate on Commercial Paper Borrowings for the Year Ended December 31,
Commercial Paper Issuer		2012 (a)		2011 (a)		2012		2011	2012		2011
Exelon Corporate	$	500	$	500	$	-	$	161	0.47	%	0.42	%
Generation		5,600		5,600		-		-	0.45	%	0.48	%
ComEd		1,000		1,000		-		-	0.50	%	0.71	%
PECO		600		600		-		-	-		-
BGE		600		400		-		-	0.43	%	0.38	%
Total	$	8,300	$	8,100	$	-	$	161

(a) Equals aggregate bank commitments under revolving and bilateral credit agreements. See discussion below and Credit Agreementstable below for items affecting effective program size.