Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Schedules Of Segment Reporting Information [Line Items]

Analysis and reconciliation of reportable segment information

												Intersegment
		Generation (a)		ComEd		PECO		BGE(b)		Other(c)		Eliminations			Exelon
Operating revenues^(d):
	2012	$	14,437	$	5,443	$	3,186	$	2,091	$	1,396	$	(3,064)		$	23,489
	2011		10,447		6,056		3,720		-		830		(1,990)			19,063
	2010		10,025		6,204		5,519		-		755		(3,859)			18,644
Intersegment revenues^(e):
	2012	$	1,702	$	2	$	3	$	9	$	1,381	$	(3,042)		$	55
	2011		1,161		2		5		-		831		(1,990)			9
	2010		3,102		2		5		-		756		(3,859)			6
Depreciation and amortization
	2012	$	768	$	610	$	217	$	238	$	46	$	2		$	1,881
	2011		570		554		202		-		21		-			1,347
	2010		474		516		1,060		-		25		-			2,075
Operating expenses^(d):
	2012	$	13,226	$	4,557	$	2,563	$	2,053	$	1,662	$	(3,043)		$	21,018
	2011		7,571		5,074		3,065		-		863		(1,990)			14,583
	2010		6,979		5,148		4,858		-		792		(3,859)			13,918
Equity in earnings (losses) of unconsolidated affiliates
	2012	$	(91)	$	-	$	-	$	-	$	-	$	-		$	(91)
	2011		(1)		-		-		-		-		-			(1)
	2010		-		-		-		-		-		-			-
Interest expense, net:
	2012	$	301	$	307	$	123	$	111	$	86	$	-		$	928
	2011		170		345		134		-		77		-			726
	2010		153		386		193		-		85		-			817
Income (loss) before income taxes:
	2012	$	1,058	$	618	$	508	$	(54)	$	(276)	$	(56)		$	1,798
	2011		2,827		666		535		-		(59)		(13)			3,956
	2010		3,150		694		476		-		(91)		(8)			4,221
Income taxes:
	2012	$	500	$	239	$	127	$	(23)	$	(215)	$	(1)		$	627
	2011		1,056		250		146		-		9		(4)			1,457
	2010		1,178		357		152		-		(27)		(2)			1,658
Net income (loss):
	2012	$	558	$	379	$	381	$	(31)	$	(61)	$	(55)		$	1,171
	2011		1,771		416		389		-		(68)		(9)			2,499
	2010		1,972		337		324		-		(64)		(6)			2,563
Capital expenditures:
	2012	$	3,554	$	1,246	$	422	$	500	$	67	$	-		$	5,789
	2011		2,491		1,028		481		-		42		-			4,042
	2010		1,883		962		545		-		14		(78)	(f)		3,326
Total assets:
	2012	$	40,681	$	22,905	$	9,353	$	7,499	$	10,432	$	(12,316)		$	78,554
	2011		27,433		22,638		9,156		-		6,147		(10,379)			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 year ended December 31, 2012 include revenue from sales to PECO of $543 million and sales to BGE of $322 million in the Mid-Atlantic region, and sales to ComEd of $795 million in the Midwest region, net of $7 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation. For the years ended December 31, 2011 and 2010 intersegment revenues for Generation include revenue from sales to PECO of $508 million and $2,092 million, respectively, in the Mid-Atlantic region, and sales to ComEd of $653 million and $1,010 million, respectively, in the Midwest region.

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

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

(d) For the years ended December 31, 2012, 2011 and 2010, utility taxes of $82 million, $27 million and $0 million, respectively, are included in revenues and expenses for Generation. For the years ended December 31, 2012, 2011 and 2010, utility taxes of $239 million, $243 million and $205 million, respectively, are included in revenues and expenses for ComEd. For the years ended December 31, 2012, 2011 and 2010, utility taxes of $141 million, $173 million and $271 million, respectively, are included in revenues and expenses for PECO. For the period of March 12, 2012 through December 31, 2012, utility taxes of $59 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 3 for additional information on AECs. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations.

(f) Represents capital projects transferred from BSC to Generation, ComEd and PECO. These projects are shown as capital expenditures at Generation, ComEd and PECO and the capital expenditure is eliminated upon consolidation.

Reconciliation of revenues from segments to consolidated

(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.

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:
	2012						2011						2010
	Revenues from external customers ^(a)		Intersegment revenues		Total Revenues		Revenues from external customers ^(a)		Intersegment revenues		Total Revenues		Revenues from external customers ^(a)		Intersegment revenues		Total Revenues
Mid-Atlantic	$	5,082	$	(44)	$	5,038	$	4,052	$	-	$	4,052	$	3,232	$	-	$	3,232
Midwest		4,824		24		4,848		5,445		-		5,445		5,762		-		5,762
New England		1,048		45		1,093		11		-		11		14		-		14
New York		582		(25)		557		0		-		0		0		-		0
ERCOT		1,365		2		1,367		575		-		575		543		-		543
Other Regions (b)		755		78		833		201		-		201		149		-		149
Total Revenues for Reportable Segments	$	13,656	$	80	$	13,736	$	10,284	$	-	$	10,284	$	9,700	$	-	$	9,700
Other (c)		781		(80)		701		163		-		163		325		-		325
Total Generation Consolidated Operating Revenues	$	14,437	$	0	$	14,437	$	10,447	$	-	$	10,447	$	10,025	$	-	$	10,025

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						2010
	RNF from external customers ^(a)		Intersegment RNF		Total RNF		RNF from external customers ^(a)		Intersegment RNF		Total RNF		RNF from external customers ^(a)		Intersegment RNF		Total RNF
Mid-Atlantic	$	3,477	$	(44)	$	3,433	$	3,350	$	-	$	3,350	$	2,501	$	-	$	2,501
Midwest		2,974		24		2,998		3,547		-		3,547		4,081		-		4,081
New England		151		45		196		9		-		9		11		-		11
New York		101		(25)		76		0		-		0		0		-		0
ERCOT		403		2		405		84		-		84		(66)		-		(66)
Other Regions (b)		53		78		131		(14)		-		(14)		(65)		-		(65)
Total Revenues net of purchased power and fuel expense for Reportable Segments	$	7,159	$	80	$	7,239	$	6,976	$	-	$	6,976	$	6,462	$	-	$	6,462
Other (c)		217		(80)		137		(118)		-		(118)		100		-		100
Total Generation Revenues net of purchased power and fuel expense	$	7,376	$	0	$	7,376	$	6,858	$	-	$	6,858	$	6,562	$	-	$	6,562

(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.

- 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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