Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Significant Accounting Policies [Line Items]

Schedule Of Capitalized Software [Text Block]

Net unamortized software costs	Exelon		Generation		ComEd		PECO		BGE
December 31, 2013	$	479	$	129	$	101	$	71	$	155
December 31, 2012		499		143		105		63		157
Amortization of capitalized software costs	Exelon (a)		Generation (a)		ComEd		PECO		BGE (a)
2013	$	198	$	67	$	52	$	33	$	36
2012		208		81		56		30		32
2011		122		41		50		25		25

Exelon activity for the year ended December 31, 2012 includes the results of Constellation and BGE for March 12, 2012 – December 31, 2012. Generation activity for the year ended December 31, 2012 includes the results of Constellation for March 12, 2012 – December 31, 2012. BGE activity represents the activity for the years ended December 31, 2012 and 2011

Schedule Of Capitalized Interest And AFUDC [Text Block]

		Exelon (a)		Generation (a)		ComEd		PECO		BGE (a)
2013	Total incurred interest (b)	$	1,423	$	411	$	584	$	117	$	129
	Capitalized interest		54		54		—		—		—
	Credits to AFUDC debt and equity		35		—		16		6		13
2012	Total incurred interest (b)	$	1,003	$	368	$	310	$	125	$	149
	Capitalized interest		67		67		—		—		—
	Credits to AFUDC debt and equity		25		—		9		6		15
2011	Total incurred interest (b)	$	783	$	219	$	349	$	138	$	136
	Capitalized interest		49		49		—		—		—
	Credits to AFUDC debt and equity		25		—		12		13		22

__________

(a)       Exelon activity for the year ended December 31, 2012 includes the results of Constellation and BGE for March 12, 2012 – December 31, 2012. Generation activity for the year ended December 31, 2012 includes the results of Constellation for March 12, 2012 – December 31, 2012. BGE activity represents the activity for the years ended December 31, 2012, 2011 and 2010.

(b)       Includes interest expense to affiliates.