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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Analysis and reconciliation of reportable segment information
Six Months Ended June 30, 2017 and 2016
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Generation(a)
 
ComEd
 
PECO
 
BGE
 
PHI(b)
 
Other(c)
 
Intersegment
Eliminations
 
Exelon
Operating revenues(d):
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
7,437

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(592
)
 
$
6,845

Competitive businesses natural gas revenues
1,348

 
—

 
—

 
—

 
—

 
—

 
—

 
1,348

Competitive businesses other revenues
276

 
—

 
—

 
—

 
—

 
—

 
(1
)
 
275

Rate-regulated electric revenues
—

 
2,656

 
1,140

 
1,237

 
2,138

 
1

 
(16
)
 
7,156

Rate-regulated natural gas revenues
—

 
—

 
286

 
388

 
87

 
—

 
(4
)
 
757

Shared service and other revenues
—

 
—

 
—

 
—

 
23

 
870

 
(893
)
 
—

2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
7,352

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(620
)
 
$
6,732

Competitive businesses natural gas revenues
1,189

 
—

 
—

 
—

 
—

 
—

 
—

 
1,189

Competitive businesses other revenues
(212
)
 
—

 
—

 
—

 
—

 
—

 
(1
)
 
(213
)
Rate-regulated electric revenues
—

 
2,535

 
1,232

 
1,264

 
1,120

 
—

 
(15
)
 
6,136

Rate-regulated natural gas revenues
—

 
—

 
273

 
345

 
28

 
—

 
(5
)
 
641

Shared service and other revenues
—

 
—

 
—

 
—

 
23

 
803

 
(826
)
 
—

Intersegment revenues(e):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
594

 
$
9

 
$
3

 
$
8

 
$
23

 
$
866

 
$
(1,503
)
 
$
—

2016
621

 
8

 
4

 
9

 
23

 
803

 
(1,466
)
 
2

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
144

 
$
259

 
$
215

 
$
169

 
$
205

 
$
54

 
$
—

 
$
1,046

2016
285

 
260

 
224

 
135

 
(257
)
 
(215
)
 
(2
)
 
430

_________
(a)
Generation includes the six 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, 2017 include revenue from sales to PECO of $79 million, sales to BGE of $233 million, sales to Pepco of $152 million, sales to DPL of $91 million, and sales to ACE of $16 million in the Mid-Atlantic region, and sales to ComEd of $23 million in the Midwest region. For the six months ended June 30, 2016, intersegment revenues for Generation 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 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 PHI's successor period, six months ended June 30, 2017 and March 24, 2016 through June 30, 2016. PHI includes the three reportable segments: Pepco, DPL and ACE. See tables below for PHI's predecessor period, including Pepco, DPL and ACE, for January 1, 2016 to March 23, 2016.
(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 18 — Supplemental Financial Information for total utility taxes for the six months ended June 30, 2017 and 2016.
(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.
Successor and Predecessor PHI:
 
Pepco
 
DPL
 
ACE
 
Other(b)
 
Intersegment
Eliminations
 
PHI
Operating revenues(a):
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
1,045

 
$
557

 
$
544

 
$
1

 
$
(9
)
 
$
2,138

Rate-regulated natural gas revenues
—

 
87

 
—

 
—

 
—

 
87

Shared service and other revenues
—

 
—

 
—

 
25

 
(2
)
 
23

March 24, 2016 to June 30, 2016 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
550

 
$
279

 
$
293

 
$
3

 
$
(5
)
 
$
1,120

Rate-regulated natural gas revenues
—

 
29

 
—

 
(1
)
 
—

 
28

Shared service and other revenues
—

 
—

 
—

 
23

 
—

 
23

January 1, 2016 to March 23, 2016 - Predecessor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
511

 
$
279

 
$
268

 
$
42

 
$
(4
)
 
$
1,096

Rate-regulated natural gas revenues
—

 
56

 
—

 
1

 
—

 
57

Shared service and other revenues
—

 
—

 
—

 
—

 
—

 
—

Intersegment revenues:
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017 - Successor
$
3

 
$
4

 
$
1

 
$
24

 
$
(9
)
 
$
23

March 24, 2016 to June 30, 2016 - Successor
2

 
2

 
1

 
23

 
(5
)
 
23

January 1, 2016 to March 23, 2016 - Predecessor
1

 
2

 
1

 
—

 
(4
)
 
—

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017 - Successor
$
101

 
$
76

 
$
36

 
$
(31
)
 
$
23

 
$
205

March 24, 2016 to June 30, 2016 - Successor
(92
)
 
(86
)
 
(102
)
 
—

 
23

 
(257
)
January 1, 2016 to March 23, 2016 - Predecessor
32

 
26

 
5

 
(44
)
 
—

 
19

_________
(a)
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 18 — Supplemental Financial Information for total utility taxes for the six months ended June 30, 2017 and 2016.
(b)
Other primarily includes PHI’s corporate operations, shared service entities and other financing and investment activities.  For the predecessor period presented, Other includes the activity of PHI’s unregulated businesses which were distributed to Exelon and Generation as a result of the PHI Merger. 
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, 2017 and 2016 is as follows:
Three Months Ended June 30, 2017 and 2016
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Generation(a)
 
ComEd
 
PECO
 
BGE
 
PHI(b)
 
Other(c)
 
Intersegment
Eliminations
 
Exelon
Operating revenues(d):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
3,719

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(266
)
 
$
3,453

Competitive businesses natural gas revenues
430

 
—

 
—

 
—

 
—

 
—

 
—

 
430

Competitive businesses other revenues
25

 
—

 
—

 
—

 
—

 
—

 
—

 
25

Rate-regulated electric revenues
—

 
1,357

 
550

 
571

 
1,040

 
—

 
(7
)
 
3,511

Rate-regulated natural gas revenues
—

 
—

 
80

 
103

 
22

 
—

 
(1
)
 
204

Shared service and other revenues
—

 
—

 
—

 
—

 
12

 
449

 
(461
)
 
—

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
)
Intersegment revenues(e):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
266

 
$
3

 
$
2

 
$
3

 
$
12

 
$
448

 
$
(734
)
 
$
—

2016
355

 
3

 
2

 
4

 
10

 
398

 
(771
)
 
1

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
 

2017
$
(266
)
 
$
118

 
$
88

 
$
45

 
$
66

 
$
13

 
$
—

 
$
64

2016
28

 
145

 
100

 
34

 
52

 
(52
)
 
(1
)
 
306

Total assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 

June 30, 2017
$
48,130

 
$
29,160

 
$
11,041

 
$
8,786

 
$
21,190

 
$
10,783

 
$
(11,986
)
 
$
117,104

December 31, 2016
46,974

 
28,335

 
10,831

 
8,704

 
21,025

 
10,369

 
(11,334
)
 
114,904


_________
(a)
Generation includes the six 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 June 30, 2017 include revenue from sales to PECO of $34 million, sales to BGE of $99 million, sales to Pepco of $68 million, sales to DPL of $40 million, and sales to ACE of $7 million in the Mid-Atlantic region, and sales to ComEd of $18 million in the Midwest region. For the three months ended June 30, 2016, intersegment revenues for Generation include revenue from sales to PECO of $64 million, sales to BGE of $135 million, sales to Pepco of $88 million, sales to DPL of $43 million, and sales to ACE of $12 million in the Mid-Atlantic region, and sales to ComEd of $13 million in the Midwest region.
(b)
Amounts included represent activity for PHI's successor period, three months ended June 30, 2017 and 2016. PHI includes the three reportable segments: Pepco, DPL and ACE.
(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 18 — Supplemental Financial Information for total utility taxes for the three months ended June 30, 2017 and 2016.
(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.
Successor PHI:
 
Pepco
 
DPL
 
ACE
 
Other(b)
 
Intersegment
Eliminations
 
PHI
Operating revenues(a):
Three months ended June 30, 2017 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
514

 
$
260

 
$
270

 
$
—

 
$
(4
)
 
$
1,040

Rate-regulated natural gas revenues
—

 
22

 
—

 
—

 
—

 
22

Shared service and other revenues
—

 
—

 
—

 
13

 
(1
)
 
12

Three months ended June 30, 2016 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
509

 
$
255

 
$
270

 
$
—

 
$
(4
)
 
$
1,030

Rate-regulated natural gas revenues
—

 
26

 
—

 
—

 
—

 
26

Shared service and other revenues
—

 
—

 
—

 
10

 
—

 
10

Intersegment revenues:
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30, 2017 - Successor
$
1

 
$
2

 
$
1

 
$
13

 
$
(5
)
 
$
12

Three months ended June 30, 2016 - Successor
1

 
2

 
1

 
10

 
(4
)
 
10

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30, 2017 - Successor
$
43

 
$
19

 
$
8

 
$
(16
)
 
$
12

 
$
66

Three months ended June 30, 2016 - Successor
49

 
12

 
3

 
(22
)
 
10

 
52

Total assets:
 
 
 
 
 
 
 
 
 
 
 
June 30, 2017 - Successor
$
7,648

 
$
4,235

 
$
3,478

 
$
10,800

 
$
(4,971
)
 
$
21,190

December 31, 2016 - Successor
7,335

 
4,153

 
3,457

 
10,804

 
(4,724
)
 
21,025

_________
(a)
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 18 — Supplemental Financial Information for total utility taxes for the three months ended June 30, 2017 and 2016.
(b)
Other primarily includes PHI’s corporate operations, shared service entities and other financing and investment activities.
Analysis and reconciliation of reportable segment revenues for Generation
Generation total revenues:
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2017
 
Three Months Ended June 30, 2016
 
Revenues
from external
customers(a)

Intersegment
revenues

Total
Revenues

Revenues
from external
customers(a)

Intersegment
revenues

Total
Revenues
Mid-Atlantic
$
1,356

 
$
9

 
$
1,365

 
$
1,432

 
$
(16
)
 
$
1,416

Midwest
1,058

 
(8
)
 
1,050

 
1,076

 
7

 
1,083

New England
438

 
(5
)
 
433

 
352

 
(1
)
 
351

New York
352

 
(5
)
 
347

 
356

 
(10
)
 
346

ERCOT
247

 
—

 
247

 
207

 
—

 
207

Other Power Regions
268

 
(9
)
 
259

 
232

 
(9
)
 
223

Total Revenues for Reportable Segments
3,719

 
(18
)
 
3,701

 
3,655

 
(29
)
 
3,626

Other(b)
455

 
18

 
473

 
(66
)
 
29

 
(37
)
Total Generation Consolidated Operating Revenues
$
4,174

 
$
—

 
$
4,174

 
$
3,589

 
$
—

 
$
3,589

__________
(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. Includes a $15 million and $9 million decrease to revenues for the amortization of intangible assets and liabilities related to commodity contracts recorded at fair value for the three months ended June 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $143 million and $615 million for the three months ended June 30, 2017 and 2016, respectively, and elimination of intersegment revenues.
Generation total revenues net of purchased power and fuel expense:
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended June 30, 2017
 
Three Months Ended June 30, 2016
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
Mid-Atlantic
$
757

 
$
26

 
$
783

 
$
830

 
$
(2
)
 
$
828

Midwest
728

 
—

 
728

 
724

 
4

 
728

New England
157

 
(10
)
 
147

 
118

 
(8
)
 
110

New York
230

 
—

 
230

 
270

 
(3
)
 
267

ERCOT
121

 
(51
)
 
70

 
111

 
(34
)
 
77

Other Power Regions
134

 
(44
)
 
90

 
123

 
(27
)
 
96

Total Revenues net of purchased power and fuel for Reportable Segments
2,127


(79
)

2,048


2,176


(70
)

2,106

Other(b)
(110
)
 
79

 
(31
)
 
(164
)
 
70

 
(94
)
Total Generation Revenues net of purchased power and fuel expense
$
2,017


$
—


$
2,017


$
2,012


$
—


$
2,012


__________
(a)
Includes purchases and sales from/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. Includes a $20 million and $12 million decrease to RNF for the amortization of intangible assets and liabilities related to commodity contracts for the three months ended June 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $184 million and $304 million for the three months ended June 30, 2017 and 2016, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.
Generation total revenues:
 
Six Months Ended June 30, 2017
 
Six Months Ended June 30, 2016
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
Mid-Atlantic
$
2,785

 
$
5

 
$
2,790

 
$
2,964

 
$
(28
)
 
$
2,936

Midwest
2,107

 
(5
)
 
2,102

 
2,166

 
13

 
2,179

New England
987

 
(7
)
 
980

 
823

 
(2
)
 
821

New York
662

 
(8
)
 
654

 
573

 
(24
)
 
549

ERCOT
439

 
(1
)
 
438

 
370

 
—

 
370

Other Power Regions
457

 
(14
)
 
443

 
456

 
(9
)
 
447

Total Revenues for Reportable Segments
7,437


(30
)

7,407


7,352


(50
)

7,302

Other(b)
1,624

 
30

 
1,654

 
977

 
50

 
1,027

Total Generation Consolidated Operating Revenues
$
9,061


$
—


$
9,061


$
8,329


$
—


$
8,329

 __________
(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. Includes a $17 million decrease to revenues and an $11 million increase to revenues for the amortization of intangible assets and liabilities related to commodity contracts recorded at fair value for the six months ended June 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $98 million and $553 million for the six months ended June 30, 2017 and 2016, respectively, and elimination of intersegment revenues.

Generation total revenues net of purchased power and fuel expense:
 
Six Months Ended June 30, 2017
 
Six Months Ended June 30, 2016
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
 
RNF
from external
customers(a)
 
Intersegment
RN
 
Total RNF
Mid-Atlantic
$
1,513

 
$
44

 
$
1,557

 
$
1,661

 
$
8

 
$
1,669

Midwest
1,431

 
12

 
1,443

 
1,443

 
6

 
1,449

New England
271

 
(14
)
 
257

 
204

 
(13
)
 
191

New York
385

 
—

 
385

 
408

 
(13
)
 
395

ERCOT
214

 
(76
)
 
138

 
192

 
(54
)
 
138

Other Power Regions
240

 
(88
)
 
152

 
211

 
(37
)
 
174

Total Revenues net of purchased power and fuel expense for Reportable Segments
4,054


(122
)

3,932


4,119


(103
)

4,016

Other(b)
52

 
122

 
174

 
190

 
103

 
293

Total Generation Revenues net of purchased power and fuel expense
$
4,106


$
—


$
4,106


$
4,309


$
—


$
4,309

__________
(a)
Includes purchases and sales from/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. Includes a $22 million decrease to RNF and a $7 million increase to RNF for the amortization of intangible assets and liabilities related to commodity contracts for the six months ended June 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $233 million and $201 million for the six months ended June 30, 2017 and 2016, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.