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Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Schedule Of Segment Reporting Information [Abstract]

Analysis and reconciliation of reportable segment information

		Generation(a)		ComEd		PECO		BGE(b)		Other(c)		Intersegment Eliminations		Exelon
Total revenues(d):
	2012	$	2,739	$	1,388	$	875	$	52	$	351	$	(719)	$	4,686
	2011		2,643		1,466		1,153				186		(492)		4,956
Intersegment revenues(e):
	2012	$	366	$	1	$	1	$	1	$	350	$	(719)	$	0
	2011		306		1		1				186		(493)		1
Net income (loss):
	2012	$	166	$	87	$	97	$	(65)	$	(85)	$	0	$	200
	2011		495		69		126				(21)		0		669
Total assets:
	March 31, 2012	$	41,723	$	22,589	$	9,215	$	7,369	$	10,876	$	(14,144)	$	77,628
	December 31, 2011		27,433		22,638		9,156				6,162		(10,394)		54,995

__________

(a) Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Regions. Intersegment revenues for Generation for the three months ended March 31, 2012 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. For the three months ended March 31, 2011 intersegment revenues for Generation include revenue from sales to PECO of $143 million in the Mid-Atlantic region, and sales to ComEd of $163 million in the Midwest region.

(b) 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, 2012 and 2011, utility taxes of $ 13 million and $ 6 million, respectively, are included in revenues and expenses for Generation. For the three months ended March 31, 2012 and 2011, utility taxes of $61 million and $64 million, respectively, are included in revenues and expenses for ComEd. For the three months ended March 31, 2012 and 2011, utility taxes of $34 million and $48 million, respectively, are included in revenues and expenses for PECO. For the period of March 12, 2012 through March 31, 2012, utility taxes of $3 million 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 2 of the Exelon 2011 Form 10-K for additional information on AECs. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations.

Analysis and reconciliation of reportable segment revenues for Generation

Generation total revenues:
	2012						2011
	Revenues from external customers (a)		Intersegment revenues		Total Revenues		Revenues from external customers (a)		Intersegment revenues (b)		Total Revenues
Mid-Atlantic	$	970	$	(4)	$	966	$	1,075	$	-	$	1,075
Midwest		1,215		4		1,219		1,427		-		1,427
New England		91		2		93		3		-		3
New York		45		(2)		43		-		-		-
ERCOT		128		-		128		101		-		101
Other Regions (c)		75		4		79		37		-		37
Total Revenues for Reportable Segments	$	2,524	$	4	$	2,528	$	2,643	$	-	$	2,643
Other (d)		215		(4)		211		-		-		0
Total Generation Consolidated Operating Revenues	$	2,739	$	-	$	2,739	$	2,643	$	-	$	2,643

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

(b) There were no transactions among Generation's reportable segments which would result in intersegment revenue for Generation for the three months ended March 31, 2011.

(d) Other represents activities not allocated to a region and includes retail and wholesale gas, upstream natural gas, proprietary trading, demand response, energy efficiency, the design, construction, and operation of renewable energy, heating, cooling, and cogeneration facilities, home improvements, sales of electric and gas appliances, servicing of heating, air conditioning, plumbing, electrical, and indoor quality systems, mark-to-market activities associated with Generation's economic hedging activities. In addition, includes generation under the reliability-must-run rate schedule and generation of Brandon Shores, H.A. Wagner, and C.P. Crane, the generating facilities planned for divestiture as a result of the Exelon and Constellation merger. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date.

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:
	2012						2011
	RNF from external customers (a)		Intersegment RNF		Total RNF		RNF from external customers (a)		Intersegment RNF (b)		Total RNF
Mid-Atlantic	$	774	$	(4)	$	770	$	914	$	-	$	914
Midwest		813		4		817		965		-		965
New England		37		2		39		2		-		2
New York		10		(2)		8		-		-		-
ERCOT		34		-		34		4		-		4
Other Regions (c)		10		4		14		(8)		-		(8)
Total Revenues net of purchased power and fuel expense for Reportable Segments	$	1,678	$	4	$	1,682	$	1,877	$	-	$	1,877
Other (d)		17		(4)		13		(117)		-		(117)
Total Generation Revenues net of purchased power and fuel expense	$	1,695	$	-	$	1,695	$	1,760	$	-	$	1,760

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

(b) There were no transactions among Generation's reportable segments which would result in intersegment revenue net of purchased power and fuel expense for Generation for the three months ended March 31, 2011.

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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