Debt and Credit Agreements Quarter-End (Tables)

12 Months Ended

Dec. 31, 2013

Debt and Credit Agreements [Line Items]

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		2013 (a)		2012 (a)		2013		2012	2013		2012
Exelon Corporate	$	500	$	500	$	0	$	0	0.27	%	0.47	%
Generation		5,600		5,600		0		0	0.32	%	0.45	%
ComEd		1,000		1,000		184		0	0.40	%	0.50	%
PECO		600		600		0		0	n.a.		n.a.
BGE		600		600		135		0	0.31	%	0.43	%
Total	$	8,300	$	8,300	$	319	$	0

(a) Equals aggregate bank commitments under the revolving and bilateral credit agreements (with the exception of a $75 million bilateral agreement) that backstop the commercial paper program. See discussion below and Credit Agreementstable below for items affecting effective program size.

Exelon
	2013			2012			2011
Average borrowings	$	254		$	199		$	218
Maximum borrowings outstanding		682			505			600
Average interest rates, computed on a daily basis		0.37	%		0.48	%		0.50	%
Average interest rates, at December 31		0.35	%		n.a.			0.44	%
Generation
	2013			2012			2011
Average borrowings	$	42		$	4		$	51
Maximum borrowings outstanding		291			165			304
Average interest rates, computed on a daily basis		0.32	%		0.45	%		0.48
Average interest rates, at December 31		n.a.			n.a.			n.a.
ComEd
	2013			2012			2011
Average borrowings	$	203		$	110		$	36
Maximum borrowings outstanding		446			366			407
Average interest rates, computed on a daily basis		0.40	%		0.50	%		0.71	%
Average interest rates, at December 31		0.37	%		n.a.			n.a.
BGE
	2013			2012			2011
Average borrowings	$	35		$	6		$	26
Maximum borrowings outstanding		135			76			190
Average interest rates, computed on a daily basis		0.31	%		0.43	%		0.38	%
Average interest rates, computed at December 31		0.31	%		n.a.			n.a.