Merger and Acquisitions (Tables)

6 Months Ended

Jun. 30, 2014

Business Acquisition [Line Items]

Schedule of Restructuring and Related Costs [Text Block]

Three Months Ended June 30, 2014
Severance Benefits		Exelon		Generation
Severance charges (a)	$	1	$	1
Total severance benefits	$	1	$	1
Six Months Ended June 30, 2014
Severance Benefits		Exelon		Generation
Severance charges (a)	$	2	$	2
Total severance benefits	$	2	$	2

Schedule Of Severance Costs [TableTextBlock]

			Exelon		Generation		ComEd		PECO		BGE
Three Months Ending
	June 30, 2014	$	4	$	2	$	0	$	0	$	0
	June 30, 2013	$	1	$	1	$	0	$	0	$	0
Six Months Ending
	June 30, 2014	$	6	$	4	$	0	$	0	$	0
	June 30, 2013	$	2	$	1	$	1	$	0	$	0