Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Schedules Of Segment Reporting Information [Line Items]

Analysis and reconciliation of reportable segment information

		Generation(a)		ComEd		PECO		BGE(b)		Other(c)		Intersegment Eliminations		Exelon
Total revenues(d):
	2013	$	3,533	$	1,160	$	895	$	880	$	318	$	(704)	$	6,082
	2012		2,743		1,388		875		52		351		(719)		4,690
Intersegment revenues(e):
	2013	$	381	$	1	$	0	$	4	$	318	$	(704)	$	0
	2012		370		1		1		1		346		(719)		0
Net income (loss):
	2013	$	(17)	$	(81)	$	122	$	80	$	(103)	$	0	$	1
	2012		166		87		97		(65)		(85)		0		200
Total assets:
	March 31, 2013	$	39,991	$	23,256	$	9,491	$	7,639	$	10,139	$	(12,273)	$	78,243
	December 31, 2012		40,681		22,905		9,353		7,506		10,432		(12,316)		78,561

__________

(a)       Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest,New England, New York, ERCOTand Other Regions. Intersegment revenues for Generation for the three months ended March 31, 2013 include revenue from sales to PECO of $ 141 million and sales to BGE of $113 million in the Mid-Atlantic region, and sales to ComEd of $145 million in the Midwest region, net of $ (17) million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation. For the three months ended March 31, 2012 intersegment revenues for Generation include revenue from sales to PECO of $111 million and sales to BGE of $19 million in the Mid-Atlantic region, and sales to ComEd of $247 million in the Midwest region, net of $11 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation.

(b)       2012 amounts represent activity recorded at BGE from March 12, 2012, the closing date of the merger, through March 31, 2012.

(c)       Other primarily includes Exelon's corporate operations, shared service entities and other financing and investment activities.

(d)       For the three months ended March 31, 2013 and 2012, utility taxes of $21 million and $13 million, respectively, are included in revenues and expenses for Generation. For the three months ended March 31, 2013 and 2012, utility taxes of $60million and $61million, respectively, are included in revenues and expenses for ComEd. For the three months ended March 31, 2013 and 2012, utility taxes of $34million and $34million, respectively, are included in revenues and expenses for PECO. For thethree months ended March 31, 2013 and for theperiod March 12, 2012 through March 31, 2012, utility taxes of $22million and $3 million, respectively, are included in revenues and expenses for BGE.

(e)       The intersegment profit associated with Generation's sale of AECs to PECO is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. See Note 3 – Regulatory Matters of the Exelon 2012 Form 10-K for additional information on AECs.For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations.

Exelon Generation Co L L C [Member]

Schedules Of Segment Reporting Information [Line Items]

Analysis and reconciliation of reportable segment revenues for Generation

Generation total revenues:
	2013						2012
	Revenues from external customers (a)		Intersegment revenues		Total Revenues		Revenues from external customers (a)		Intersegment revenues		Total Revenues
Mid-Atlantic	$	1,331	$	(8)	$	1,323	$	970	$	(4)	$	966
Midwest		1,181		7		1,188		1,215		4		1,219
New England		391		12		403		91		2		93
New York		175		(6)		169		45		(2)		43
ERCOT		293		0		293		128		-		128
Other Regions (b)		183		42		225		75		4		79
Total Revenues for Reportable Segments	$	3,554	$	47	$	3,601	$	2,524	$	4	$	2,528
Other (c)		(21)		(47)		(68)		219		(4)		215
Total Generation Consolidated Operating Revenues	$	3,533	$	0	$	3,533	$	2,743	$	-	$	2,743

(a)       Includes all electric sales to third parties and affiliated sales to ComEd, PECO and BGE.

(b)       Other regions include the South, West and Canada, which are not considered individually significant.

(c)Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date of $174 million and $122 million, for the three months ended March 31, 2013 and 2012, respectively.

Analysis and reconciliation of reportable segment revenues net of purchased power and fuel expense for Generation

Generation total revenues net of purchased power and fuel expense:
	2013						2012
	RNF from external customers (a)		Intersegment RNF		Total RNF		RNF from external customers (a)		Intersegment RNF		Total RNF
Mid-Atlantic	$	852	$	(8)	$	844	$	774	$	(4)	$	770
Midwest		710		7		717		813		4		817
New England		18		12		30		37		2		39
New York		(16)		(6)		(22)		10		(2)		8
ERCOT		112		(11)		101		34		-		34
Other Regions (b)		10		35		45		10		4		14
Total Revenues net of purchased power and fuel expense for Reportable Segments	$	1,686	$	29	$	1,715	$	1,678	$	4	$	1,682
Other (c)		(322)		(29)		(351)		21		(4)		17
Total Generation Revenues net of purchased power and fuel expense	$	1,364	$	0	$	1,364	$	1,699	$	-	$	1,699

(a)Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.

(b)Other regions includes the South, West and Canada, which are not considered individually significant.

(c)Other represents activities not allocated to a region. See text above for a description of included activities. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date of $174 million and $122 million, for the three months ended March 31, 2013 and 2012, respectively.