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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment information
Months Ended September 30, 2015 and 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Generation(a)
 
ComEd
 
PECO
 
BGE
 
Other(b)
 
Intersegment
Eliminations
 
Exelon
Total revenues(c):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
14,841

 
$
3,709

 
$
2,386

 
$
2,388

 
$
1,007

 
$
(1,585
)
 
$
22,746

2014
12,591

 
3,484

 
2,343

 
2,404

 
924

 
(1,573
)
 
20,173

Intersegment revenues(d):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
567

 
$
3

 
$
1

 
$
10

 
$
1,003

 
$
(1,581
)
 
$
3

2014
630

 
2

 
1

 
21

 
920

 
(1,574
)
 
—

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
1,208

 
$
339

 
$
299

 
$
212

 
$
(96
)
 
$
(3
)
 
$
1,959

2014
1,037

 
335

 
255

 
156

 
(58
)
 
—

 
1,725


 __________
(a)
Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Power Regions. Intersegment revenues for Generation for the nine months ended September 30, 2015 include revenue from sales to PECO of $173 million and sales to BGE of $376 million in the Mid-Atlantic region, and sales to ComEd of $17 million in the Midwest. For the nine months ended September 30, 2014, intersegment revenues for Generation include revenue from sales to PECO of $165 million and sales to BGE of $290 million in the Mid-Atlantic region, and sales to ComEd of $175 million in the Midwest region.
(b)
Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(c)
For the nine months ended September 30, 2015 and 2014, utility taxes of $79 million and $67 million, respectively, are included in revenues and expenses for Generation. For the nine months ended September 30, 2015 and 2014, utility taxes of $180 million and $180 million, respectively, are included in revenues and expenses for ComEd. For the nine months ended September 30, 2015 and 2014, utility taxes of $104 million and $99 million, respectively, are included in revenues and expenses for PECO. For the nine months ended September 30, 2015 and 2014, utility taxes of $67 million and $64 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.

Three Months Ended September 30, 2015 and 2014
 
Generation(a)
 
ComEd
 
PECO
 
BGE
 
Other(b)
 
Intersegment Eliminations
 
Exelon
Total revenues(c):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
4,768

 
$
1,376

 
$
740

 
$
725

 
$
348

 
$
(556
)
 
$
7,401

2014
4,412

 
1,222

 
693

 
697

 
305

 
(417
)
 
6,912

Intersegment revenues(d):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
205

 
$
1

 
$
1

 
$
3

 
$
347

 
$
(555
)
 
$
2

2014
112

 
1

 
—

 
3

 
302

 
(418
)
 
—

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
$
332

 
$
149

 
$
90

 
$
54

 
$
(36
)
 
$
(2
)
 
$
587

2014
849

 
126

 
81

 
49

 
(31
)
 
—

 
1,074

Total assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2015
$
46,479

 
$
26,129

 
$
10,072

 
$
8,134

 
$
16,256

 
$
(11,942
)
 
$
95,128

December 31, 2014
45,348

 
25,392

 
9,943

 
8,078

 
9,794

 
(11,741
)
 
86,814

 __________
(a)
Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Power Regions. Intersegment revenues for Generation for the three months ended September 30, 2015 include revenue from sales to PECO of $61 million and sales to BGE of $141 million in the Mid-Atlantic region, and sales to ComEd of $2 million in the Midwest. For the three months ended September 30, 2014, intersegment revenues for Generation include revenue from sales to PECO of $28 million and sales to BGE of $83 million in the Mid-Atlantic region, and sales to ComEd of $1 million in the Midwest region.
(b)
Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(c)
For the three months ended September 30, 2015 and 2014, utility taxes of $28 million and $22 million, respectively, are included in revenues and expenses for Generation. For the three months ended September 30, 2015 and 2014, utility taxes of $63 million and $61 million, respectively, are included in revenues and expenses for ComEd. For the three months ended September 30, 2015 and 2014, utility taxes of $37 million and $34 million, respectively, are included in revenues and expenses for PECO. For the three months ended September 30, 2015 and 2014, utility taxes of $23 million and $21 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.
Analysis and reconciliation of reportable segment revenues for Generation
 
Nine Months Ended September 30, 2015
 
Nine Months Ended September 30, 2014
 
Revenues
from External
Customers(b)
 
Intersegment
Revenues
 
Total
Revenues
 
Revenues
from External
Customers(b)
 
Intersegment
Revenues
 
Total
Revenues
Mid-Atlantic(a)
$
4,475

 
$
16

 
$
4,491

 
$
3,998

 
$
(14
)
 
$
3,984

Midwest
3,630

 
3

 
3,633

 
3,302

 
11

 
3,313

New England
1,743

 
3

 
1,746

 
1,028

 
5

 
1,033

New York(a)
786

 
(8
)
 
778

 
614

 
(1
)
 
613

ERCOT
691

 
(4
)
 
687

 
743

 
(2
)
 
741

Other Power Regions(c)
891

 
(11
)
 
880

 
1,027

 
(4
)
 
1,023

Total Revenues for Reportable Segments
12,216

 
(1
)
 
12,215

 
10,712

 
(5
)
 
10,707

Other(d)
2,625

 
1

 
2,626

 
1,879

 
5

 
1,884

Total Generation Consolidated Operating Revenues
$
14,841

 
$
—

 
$
14,841

 
$
12,591

 
$
—

 
$
12,591

 __________
(a)
On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet. As a result, beginning on April 1, 2014, CENG's revenues are included on a fully consolidated basis.
(b)
Includes all wholesale and retail electric sales to third parties and affiliated sales to ComEd, PECO and BGE.
(c)
Other Power Regions includes the South, West and Canada.
(d)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $19 million increase to revenues and a $203 million decrease to revenues for the amortization of intangible assets related to commodity contracts for the nine months ended September 30, 2015 and 2014, respectively, unrealized mark-to-market gains of $171 million and losses of $572 million for the nine months ended September 30, 2015 and 2014, respectively, and elimination of intersegment revenues.
Generation total revenues net of purchased power and fuel expense:
 
Three Months Ended September 30, 2015
 
Three Months Ended September 30, 2014
 
RNF
from External
Customers(a)
 
Intersegment RNF
 
Total RNF
 
RNF
from External
Customers(a)
 
Intersegment RNF
 
Total RNF
Mid-Atlantic
$
974

 
$
17

 
$
991

 
$
921

 
$
14

 
$
935

Midwest
752

 
—

 
752

 
722

 
(6
)
 
716

New England
145

 
(12
)
 
133

 
120

 
(30
)
 
90

New York
159

 
8

 
167

 
176

 
10

 
186

ERCOT
166

 
(55
)
 
111

 
186

 
(77
)
 
109

Other Power Regions(b)
167

 
(84
)
 
83

 
157

 
(89
)
 
68

Total Revenues net of purchased power and fuel for Reportable Segments
2,363


(126
)

2,237


2,282


(178
)

2,104

Other(c)
(114
)
 
126

 
12

 
250

 
178

 
428

Total Generation Revenues net of purchased power and fuel expense
$
2,249


$
—


$
2,249


$
2,532


$
—


$
2,532


__________
(a)
Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.
(b)
Other Power Regions includes the South, West and Canada.
(c)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $4 million decrease to RNF and a $15 million increase to RNF for the amortization of intangible assets related to commodity contracts for the three months ended September 30, 2015 and 2014, respectively, unrealized mark-to-market losses of $139 million and gains of $267 million for the three months ended September 30, 2015 and 2014, respectively, and the elimination of intersegment revenues.

Generation total revenues:
 
Three Months Ended September 30, 2015
 
Three Months Ended September 30, 2014
 
Revenues
from External
Customers(a)

Intersegment
Revenues

Total
Revenues

Revenues
from External
Customers(a)

Intersegment
Revenues

Total
Revenues
Mid-Atlantic
$
1,622

 
$
10

 
$
1,632

 
$
1,285

 
$
4

 
$
1,289

Midwest
1,150

 
1

 
1,151

 
1,062

 
(1
)
 
1,061

New England
519

 
1

 
520

 
272

 
—

 
272

New York
254

 
(4
)
 
250

 
230

 
2

 
232

ERCOT
317

 
(1
)
 
316

 
303

 
(1
)
 
302

Other Power Regions(b)
383

 
(7
)
 
376

 
381

 
(6
)
 
375

Total Revenues for Reportable Segments
4,245

 
—

 
4,245

 
3,533

 
(2
)
 
3,531

Other(c)
523

 
—

 
523

 
879

 
2

 
881

Total Generation Consolidated Operating Revenues
$
4,768

 
$
—

 
$
4,768

 
$
4,412

 
$
—

 
$
4,412

__________
(a)
Includes all electric sales to third parties and affiliated sales to ComEd, PECO and BGE.
(b)
Other Power Regions includes the South, West and Canada.
(c)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $3 million decrease to revenues and a $22 million decrease to revenues for the amortization of intangible assets related to commodity contracts for the three months ended September 30, 2015 and 2014, respectively, unrealized mark-to-market losses of $7 million and gains of $271 million for the three months ended September 30, 2015 and 2014, respectively, and the elimination of intersegment revenues.
 
Nine Months Ended September 30, 2015
 
Nine Months Ended September 30, 2014
 
RNF
from External
Customers(b)
 
Intersegment
RNF
 
Total
RNF
 
RNF
from External
Customers(b)
 
Intersegment
RNF
 
Total
RNF
Mid-Atlantic(a)
$
2,633

 
$
30

 
$
2,663

 
$
2,610

 
$
(60
)
 
$
2,550

Midwest
2,198

 
(3
)
 
2,195

 
1,856

 
21

 
1,877

New England
416

 
(37
)
 
379

 
362

 
(72
)
 
290

New York(a)
471

 
27

 
498

 
289

 
24

 
313

ERCOT
344

 
(109
)
 
235

 
457

 
(207
)
 
250

Other Power Regions(c)
403

 
(210
)
 
193

 
465

 
(216
)
 
249

Total Revenues net of purchased power and fuel expense for Reportable Segments
6,465

—

(302
)
 
6,163

 
6,039

 
(510
)
 
5,529

Other(d)
576

 
302

 
878

 
(519
)
 
510

 
(9
)
Total Generation Revenues net of purchased power and fuel expense
$
7,041

—

$
—

 
$
7,041

 
$
5,520

 
$
—

 
$
5,520

 __________
(a)
On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet. As a result, starting on April 1, 2014, CENG's revenue net of purchased power and fuel expense are included on a fully consolidated basis.
(b)
Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.
(c)
Other Power Regions includes the South, West and Canada.
(d)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $20 million increase to RNF and a $78 million decrease to RNF for the amortization of intangible assets related to commodity contracts for the nine months ended September 30, 2015 and 2014, respectively, unrealized mark-to-market gains of $258 million and losses of $477 million for the nine months ended September 30, 2015 and 2014, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.