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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment information
An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the three and six months ended June 30, 2016 and 2015 is as follows:

Three Months Ended June 30, 2016 and 2015
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Generation(a)
 
ComEd
 
PECO
 
BGE
 
PHI(b)
 
Other(c)
 
Intersegment
Eliminations
 
Exelon
Operating revenues(d):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
3,655

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(354
)
 
$
3,301

Competitive businesses natural gas revenues
367

 
—

 
—

 
—

 
—

 
—

 
—

 
367

Competitive businesses other revenues
(433
)
 
—

 
—

 
—

 
—

 
—

 
(1
)
 
(434
)
Rate-regulated electric revenues
—

 
1,286

 
587

 
584

 
1,030

 
—

 
(7
)
 
3,480

Rate-regulated natural gas revenues
—

 
—

 
77

 
96

 
26

 
—

 
(2
)
 
197

Shared service and other revenues
—

 
—

 
—

 
—

 
10

 
398

 
(409
)
 
(1
)
2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
3,663

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(151
)
 
$
3,512

Competitive businesses natural gas revenues
431

 
—

 
—

 
—

 
—

 
—

 
—

 
431

Competitive businesses other revenues
138

 
—

 
—

 
—

 
—

 
—

 
(1
)
 
137

Rate-regulated electric revenues
—

 
1,148

 
582
 
541
 
—

 
—

 
(1
)
 
2,270

Rate-regulated natural gas revenues
—

 
—

 
79
 
87
 
—

 
—

 
(1
)
 
165

Shared service and other revenues
—

 
—

 
—

 
—

 
—

 
340

 
(341
)
 
(1
)
Intersegment revenues(e):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
$
355

 
$
3

 
$
2

 
$
4

 
$
10

 
$
398

 
$
(771
)
 
$
1

2015
152

 
1

 
—

 
1

 
—

 
340

 
(493
)
 
1

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
 

2016
$
28

 
$
145

 
$
100

 
$
34

 
$
52

 
$
(52
)
 
$
(1
)
 
$
306

2015
390

 
99

 
70

 
47

 
—

 
28

 
(1
)
 
633

Total assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 

June 30, 2016
$
46,897

 
$
28,105

 
$
10,586

 
$
8,325

 
$
20,921

 
$
10,069

 
$
(12,125
)
 
$
112,778

December 31, 2015
46,529

 
26,532

 
10,367

 
8,295

 
—

 
15,389

 
(11,728
)
 
95,384
Analysis and reconciliation of reportable segment revenues for Generation
_________
(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 six months ended June 30, 2016 include revenue from sales to PECO of $143 million and sales to BGE of $306 million in the Mid-Atlantic region, and sales to ComEd of $18 million in the Midwest region. For the six months ended June 30, 2015, intersegment revenues for Generation include revenue from sales to PECO of $112 million and sales to BGE of $235 million in the Mid-Atlantic region, and sales to ComEd of $15 million in the Midwest region. For the Successor period of March 24, 2016 to June 30, 2016, intersegment revenues for Generation include revenue from sales to Pepco of $94 million, sales to DPL of $47 million, and sales to ACE of $13 million in the Mid-Atlantic region.
(b)
Amounts included represent activity for the PHI's successor period, March 24, 2016 through June 30, 2016. PHI includes the three reportable segments: Pepco, DPL and ACE. See tables below for PHI's predecessor periods, including Pepco, DPL and ACE, for January 1, 2016 to March 23, 2016 and for the six months ended June 30, 2015.
(c)
Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(d)
Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses on the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 19 — Supplemental Financial Information for total utility taxes for the three months ended June 30, 2016 and 2015.
(e)
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.


Generation total revenues:

 
Six Months Ended June 30, 2016
 
Six Months Ended June 30, 2015
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
 
Revenues
from external
customers(a)(c)
 
Intersegment
revenues(c)
 
Total
Revenues(c)
Mid-Atlantic
$
2,964

 
$
(28
)
 
$
2,936

 
$
2,920

 
$
(61
)
 
$
2,859

Midwest
2,166

 
13

 
2,179

 
2,482

 
—

 
2,482

New England
823

 
(2
)
 
821

 
1,232

 
(6
)
 
1,226

New York
573

 
(24
)
 
549

 
529

 
(1
)
 
528

ERCOT
370

 
—

 
370

 
375

 
(3
)
 
372

Other Power Regions
456

 
(9
)
 
447

 
522

 
(19
)
 
503

Total Revenues for Reportable Segments
7,352


(50
)

7,302


8,060


(90
)

7,970

Other(b)
977

 
50

 
1,027

 
2,014

 
90

 
2,104

Total Generation Consolidated Operating Revenues
$
8,329


$
—


$
8,329


$
10,074


$
—


$
10,074

 __________
(a)
Includes all wholesale and retail electric sales to third parties and affiliated sales to the Utility Registrants.
(b)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes an $11 million and a $22 million increase to revenues for the amortization of intangible assets related to commodity contracts recorded at fair value for the six months ended June 30, 2016 and 2015, respectively, unrealized mark-to-market losses of $553 million and gains of $179 million for the six months ended June 30, 2016 and 2015, respectively, and elimination of intersegment revenues.
(c)
Exelon corrected an error in the June 30, 2015 balances within Intersegment Revenue and Revenue from external customers for an overstatement of $89 million of Intersegment Revenue for Reportable Segments for the six months ended June 30, 2015, an understatement of Revenue from external customers for Reportable Segments of $89 million for the six months ended June 30, 2015, an understatement of $89 million of Intersegment Revenue for Other for the six months ended June 30, 2015, and an overstatement of Revenue from external customers for Other of $89 million for the six months ended June 30, 2015. This error is not considered material to any prior period, and there is no impact to Total Revenues.


Generation total revenues net of purchased power and fuel expense:

 
Six Months Ended June 30, 2016
 
Six Months Ended June 30, 2015
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total
RNF
 
RNF
from external
customers(a)(c)
 
Intersegment
RNF(c)
 
Total
RNF(c)
Mid-Atlantic
$
1,661

 
$
8

 
$
1,669

 
$
1,690

 
$
(11
)
 
$
1,679

Midwest
1,443

 
6

 
1,449

 
1,454

 
(6
)
 
1,448

New England
204

 
(13
)
 
191

 
277

 
(31
)
 
246

New York
408

 
(13
)
 
395

 
306

 
28

 
334

ERCOT
192

 
(54
)
 
138

 
179

 
(54
)
 
125

Other Power Regions
211

 
(37
)
 
174

 
185

 
(77
)
 
108

Total Revenues net of purchased power and fuel expense for Reportable Segments
4,119


(103
)

4,016


4,091


(151
)

3,940

Other(b)
190

 
103

 
293

 
701

 
151

 
852

Total Generation Revenues net of purchased power and fuel expense
$
4,309


$
—


$
4,309


$
4,792


$
—


$
4,792
Exelon Generation Co L L C [Member]  
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment revenues for Generation
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2016
 
Three Months Ended June 30, 2015
 
RNF
from external
customers(a)
 
Intersegment RNF
 
Total RNF
 
RNF
from external
customers(a)(c)
 
Intersegment RNF(c)
 
Total RNF(c)
Mid-Atlantic
$
830

 
$
(2
)
 
$
828

 
$
891

 
$
1

 
$
892

Midwest
724

 
4

 
728

 
750

 
(5
)
 
745

New England
118

 
(8
)
 
110

 
95

 
(7
)
 
88

New York
270

 
(3
)
 
267

 
138

 
7

 
145

ERCOT
111

 
(34
)
 
77

 
91

 
(21
)
 
70

Other Power Regions
123

 
(27
)
 
96

 
113

 
(51
)
 
62

Total Revenues net of purchased power and fuel for Reportable Segments
2,176


(70
)

2,106


2,078


(76
)

2,002

Other(b)
(164
)
 
70

 
(94
)
 
305

 
76

 
381

Total Generation Revenues net of purchased power and fuel expense
$
2,012


$
—


$
2,012


$
2,383


$
—


$
2,383


__________
(a)
Includes purchases and sales from third parties and affiliated sales to the Utility Registrants.
(b)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $12 million decrease and a $14 million decrease to RNF for the amortization of intangible assets related to commodity contracts for the three months ended June 30, 2016 and 2015, respectively, unrealized mark-to-market losses of $304 million and gains of $235 million for the three months ended June 30, 2016 and 2015, respectively, accelerated nuclear fuel amortization associated with nuclear decommissioning as discussed at Note 7 - Early Nuclear Plant Retirements of the Combined Notes to Consolidated Financial Statements of $9 million for the three months ended June 30, 2016, and the elimination of intersegment revenue net of purchased power and fuel expense.
(c)
Exelon corrected an error in the June 30, 2015 balances within Intersegment RNF and RNF from external customers for an understatement of $6 million of Intersegment RNF for Reportable Segments for the three months ended June 30, 2015, and an overstatement of $6 million of Intersegment RNF for Other for the three months ended June 30, 2015. This also included an understatement of total RNF for Reportable Segments and an overstatement of total RNF for Other of $6 million for the three months ended June 30, 2015. The error is not considered material to any prior period, and there is no net impact to Generation Total RNF for 2015.

 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2016
 
Three Months Ended June 30, 2015
 
Revenues
from external
customers(a)

Intersegment
revenues

Total
Revenues

Revenues
from external
customers(a)(c)

Intersegment
revenues(c)

Total
Revenues(c)
Mid-Atlantic
$
1,432

 
$
(16
)
 
$
1,416

 
$
1,364

 
$
(18
)
 
$
1,346

Midwest
1,076

 
7

 
1,083

 
1,206

 
—

 
1,206

New England
352

 
(1
)
 
351

 
367

 
—

 
367

New York
356

 
(10
)
 
346

 
222

 
(4
)
 
218

ERCOT
207

 
—

 
207

 
194

 
(2
)
 
192

Other Power Regions
232

 
(9
)
 
223

 
310

 
(21
)
 
289

Total Revenues for Reportable Segments
3,655

 
(29
)
 
3,626

 
3,663

 
(45
)
 
3,618

Other(b)
(66
)
 
29

 
(37
)
 
569

 
45

 
614

Total Generation Consolidated Operating Revenues
$
3,589

 
$
—

 
$
3,589

 
$
4,232

 
$
—

 
$
4,232


 __________
(a)
Includes all wholesale and retail electric sales to third parties and affiliated sales to the Utility Registrants.
(b)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $9 million decrease and $17 million decrease to revenues for the amortization of intangible assets related to commodity contracts recorded at fair value for the three months ended June 30, 2016 and 2015, respectively, unrealized mark-to-market losses of $615 million and gains of $25 million for the three months ended June 30, 2016 and 2015, respectively, and elimination of intersegment revenues.
(c)
Exelon corrected an error in the June 30, 2015 balances within Intersegment Revenue and Revenue from external customers for an overstatement of $46 million of Intersegment Revenue for Reportable Segments for the three months ended June 30, 2015, an understatement of Revenue from external customers for Reportable Segments of $46 million for the three months ended June 30, 2015, an understatement of $46 million of Intersegment Revenue for Other for the three months ended June 30, 2015, and an overstatement of Revenue from external customers for Other of $46 million for the three months ended June 30, 2015. This error is not considered material to any prior period, and there is no impact to Total Revenues.