Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting Information [Line Items]

Analysis and reconciliation of reportable segment information

												Intersegment Eliminations
		Generation (a)		ComEd		PECO		BGE		Other (b)					Exelon
Total revenues (c):
	2014	$	4,390	$	1,134	$	993	$	1,054	$	290	$	(624)	$	7,237
	2013		3,533		1,160		895		880		318		(704)		6,082
Intersegment revenues (d):
	2014	$	316	$	1	$	1	$	16	$	290	$	(623)	$	1
	2013		381		1		0		4		318		(704)		0
Net income (loss):
	2014	$	(185)	$	98	$	89	$	88	$	4	$	(1)	$	93
	2013		(17)		(81)		122		80		(103)		0		1
Total assets:
	March 31, 2014	$	41,080	$	24,294	$	9,766	$	7,958	$	8,146	$	(11,776)	$	79,468
	December 31, 2013		41,232		24,118		9,617		7,861		8,317		(11,221)		79,924

__________

(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, 2014 include revenue from sales to PECO of $88 million and sales to BGE of $120 million in the Mid-Atlantic region, and sales to ComEd of $108 million in the Midwest. For the three months ended March 31, 2013 intersegment revenues for Generation 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.

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

(c)       For the three months ended March 31, 2014 and 2013, utility taxes of $24 million and $21 million, respectively, are included in revenues and expenses for Generation. For the three months ended March 31, 2014 and 2013, utility taxes of $63million and $60million, respectively, are included in revenues and expenses for ComEd. For the three months ended March 31, 2014 and 2013, utility taxes of $35million and $34million, respectively, are included in revenues and expenses for PECO. For thethree months ended March 31, 2014 and2013, utility taxes of $20million and $22 million, respectively, are included in revenues and expenses for BGE.

(d)       Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with Generation's sale of certain products and services by and between Exelon's segments is not eliminated in consolidation due to the recognition of intersegment profitin accordance with regulatory accounting guidance. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations and Comprehensive Income.

Exelon Generation Co L L C [Member]

Segment Reporting Information [Line Items]

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 (three months ended):
	2014						2013
	RNF from external customers (a)		Intersegment RNF		Total RNF		RNF from external customers (a)		Intersegment RNF		Total RNF
Mid-Atlantic	$	784	$	(89)	$	695	$	852	$	(8)	$	844
Midwest		530		26		556		710		7		717
New England		154		(18)		136		18		12		30
New York		(29)		8		(21)		(16)		(6)		(22)
ERCOT		155		(72)		83		112		(11)		101
Other Regions (b)		150		(45)		105		10		35		45
Total Revenues net of purchased power and fuel expense for Reportable Segments		1,744		(190)		1,554		1,686		29		1,715
Other (c)		(711)		190		(521)		(322)		(29)		(351)
Total Generation Revenues net of purchased power and fuel expense	$	1,033	$	0	$	1,033	$	1,364	$	-	$	1,364

(a)Includes purchases and sales from 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 of $42 million and $174million for the three months ended March 31, 2014 and 2013, respectively, and the elimination of intersegment revenues.