Segment Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting Information [Line Items]

Analysis and reconciliation of reportable segment information

Three Months Ended June 30, 2014 and 2013

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(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 June 30, 2014 include revenue from sales to PECO of $49 million and sales to BGE of $87 million in the Mid-Atlantic region, and sales to ComEd of $65 million in the Midwest region. For the three months ended June 30, 2013 intersegment revenues for Generation include revenue from sales to PECO of $97 million and sales to BGE of $99 million in the Mid-Atlantic region, sales to ComEd of $121million in the Midwest region, and$10 million related to the unrealized mark-to-market gainsrelated 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 June 30, 2014 and 2013, utility taxes of $21 million and $18 million, respectively, are included in revenues and expenses for Generation. For the three months ended June 30, 2014 and 2013, utility taxes of $56 million and $56 million, respectively, are included in revenues and expenses for ComEd. For the three months ended June 30, 2014 and 2013, utility taxes of $30 million and $31 million, respectively, are included in revenues and expenses for PECO. For the three months ended June 30, 2014 and 2013, utility taxes of $19 million and $19 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 profit in accordance with regulatory accounting guidance. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations and Comprehensive Income.

Six Months Ended June 30, 2014 and 2013

												Intersegment Eliminations
		Generation (a)(b)		ComEd		PECO		BGE		Other (c)					Exelon
Total revenues (d):
	2014	$	8,179	$	2,262	$	1,649	$	1,707	$	619	$	(1,155)	$	13,261
	2013		7,603		2,239		1,567		1,533		615		(1,334)		12,223
Intersegment revenues (e):
	2014	$	517	$	1	$	1	$	18	$	618	$	(1,155)	$	0
	2013		710		1		0		8		615		(1,334)		0
Net income (loss):
	2014	$	188	$	209	$	173	$	106	$	(25)	$	0	$	651
	2013		310		14		200		106		(132)		0		498

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(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 six months ended June 30, 2014 include revenue from sales to PECO of $ 137 million and sales to BGE of $ 207 million in the Mid-Atlantic region, and sales to ComEd of $ 173 million in the Midwest region. For the six months ended June 30, 2013 intersegment revenues for Generation include revenue from sales to PECO of $238 million in the Mid-Atlantic region and sales to BGE of $212 million in the Mid-Atlantic region, and sales to ComEd of $266million 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.

(b)Amounts include activity recorded at CENG from April 1, 2014, the date of integration, through June 30, 2014.

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

(d)For the six months ended June 30, 2014 and 2013, utility taxes of $45 million and $39 million, respectively, are included in revenues and expenses for Generation. For the six months ended June 30, 2014 and 2013, utility taxes of $119 million and $117 million, respectively, are included in revenues and expenses for ComEd. For the six months ended June 30, 2014 and 2013, utility taxes of $65 million and $64 million, respectively, are included in revenues and expenses for PECO. For the six months ended June 30, 2014 and 2013, utility taxes of $43 million and $41 million, respectively, are included in revenues and expenses for BGE.

(e)Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with the 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 profit in 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

Three Months Ended June 30, 2014 and 2013

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	$	906	$	14	$	920	$	770	$	(2)	$	768
Midwest		604		1		605		687		(3)		684
New England		88		(24)		64		85		(35)		50
New York		142		6		148		0		14		14
ERCOT		117		(58)		59		143		(31)		112
Other Regions (b)		157		(82)		75		111		(52)		59
Total Revenues net of purchased power and fuel expense for Reportable Segments		2,014		(143)		1,871		1,796		(109)		1,687
Other (c)		(60)		143		83		328		109		437
Total Generation Revenues net of purchased power and fuel expense	$	1,954	$	0	$	1,954	$	2,124	$	-	$	2,124

(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 valueat the date ofmerger with Constellation and the consolidation of CENGin purchase accounting of $50 million and $167million for the three months ended June 30, 2014 and 2013, respectively, and the elimination of intersegment revenues.

Six Months Ended June 30, 2014 and 2013

Generation total revenues net of purchased power and fuel expense (six months ended):
	2014						2013
	RNF from external customers (a)		Intersegment RNF		Total RNF		RNF from external customers (a)		Intersegment RNF		Total RNF
Mid-Atlantic (b)	$	1,690	$	(75)	$	1,615	$	1,622	$	(10)	$	1,612
Midwest		1,134		27		1,161		1,397		4		1,401
New England		242		(42)		200		103		(23)		80
New York (b)		113		14		127		(16)		8		(8)
ERCOT		272		(130)		142		255		(42)		213
Other Regions (c)		307		(127)		180		122		(17)		105
Total Revenues net of purchased power and fuel expense for Reportable Segments		3,758		(333)		3,425		3,483		(80)		3,403
Other (d)		(770)		333		(437)		6		80		86
Total Generation Revenues net of purchased power and fuel expense	$	2,988	$	0	$	2,988	$	3,489	$	0	$	3,489

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

(b)Amounts include activity recorded at CENG from April 1, 2014, the date of integration, through June 30, 2014.

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

(d)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 valueat the date of merger with Constellation and the consolidation of CENG in purchase accounting of $92 million and $341million, for the six months ended June 30, 2014 and 2013, respectively.