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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Analysis and reconciliation of reportable segment information
Nine Months Ended September 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
$
11,485

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(888
)
 
$
10,597

Competitive businesses natural gas revenues
1,807

 
—

 
—

 
—

 
—

 
—

 
—

 
1,807

Competitive businesses other revenues
520

 
—

 
—

 
—

 
—

 
—

 
—

 
520

Rate-regulated electric revenues
—

 
4,227

 
1,802

 
1,895

 
3,417

 
—

 
(23
)
 
11,318

Rate-regulated natural gas revenues
—

 
—

 
339

 
468

 
105

 
—

 
(6
)
 
906

Shared service and other revenues
—

 
—

 
—

 
—

 
35

 
1,316

 
(1,350
)
 
1

2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
11,677

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(1,118
)
 
$
10,559

Competitive businesses natural gas revenues
1,515

 
—

 
—

 
—

 
—

 
—

 
—

 
1,515

Competitive businesses other revenues
171

 
—

 
—

 
—

 
—

 
—

 
(2
)
 
169

Rate-regulated electric revenues
—

 
4,031

 
1,971

 
1,998

 
2,485

 
—

 
(24
)
 
10,461

Rate-regulated natural gas revenues
—

 
—

 
322

 
423

 
46

 
—

 
(10
)
 
781

Shared service and other revenues
—

 
—

 
—

 
—

 
34

 
1,166

 
(1,199
)
 
1

Intersegment revenues(e):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
888

 
$
12

 
$
5

 
$
12

 
$
35

 
$
1,312

 
$
(2,262
)
 
$
2

2016
1,121

 
12

 
5

 
16

 
34

 
1,166

 
(2,351
)
 
3

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
491

 
$
447

 
$
327

 
$
231

 
$
359

 
$
58

 
$
(2
)
 
$
1,911

2016
556

 
297

 
346

 
191

 
(91
)
 
(340
)
 
(3
)
 
956

_________
(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 nine months ended September 30, 2017 include revenue from sales to PECO of $111 million, sales to BGE of $330 million, sales to Pepco of $209 million, sales to DPL of $138 million, and sales to ACE of $23 million in the Mid-Atlantic region, and sales to ComEd of $77 million in the Midwest region. For the nine months ended September 30, 2016, intersegment revenues for Generation include revenue from sales to PECO of $234 million and sales to BGE of $489 million in the Mid-Atlantic region, and sales to ComEd of $38 million in the Midwest region. For the Successor period of March 24, 2016 to September 30, 2016, intersegment revenues for Generation include revenue from sales to Pepco of $223 million, sales to DPL of $109 million, and sales to ACE of $28 million in the Mid-Atlantic region.
(b)
Amounts included represent activity for PHI's successor period, nine months ended September 30, 2017 and March 24, 2016 through September 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 19 — Supplemental Financial Information for total utility taxes for the nine months ended September 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):
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
1,649

 
$
866

 
$
915

 
$
—

 
$
(13
)
 
$
3,417

Rate-regulated natural gas revenues
—

 
105

 
—

 
—

 
—

 
105

Shared service and other revenues
—

 
—

 
—

 
37

 
(2
)
 
35

March 24, 2016 to September 30, 2016 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
1,184

 
$
593

 
$
714

 
$
3

 
$
(9
)
 
$
2,485

Rate-regulated natural gas revenues
—

 
46

 
—

 
—

 
—

 
46

Shared service and other revenues
—

 
—

 
—

 
34

 
—

 
34

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:
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017 - Successor
$
4

 
$
6

 
$
2

 
$
37

 
$
(14
)
 
$
35

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

 
4

 
2

 
35

 
(9
)
 
34

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

 
2

 
1

 
—

 
(4
)
 
—

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017 - Successor
$
188

 
$
107

 
$
77

 
$
(48
)
 
$
35

 
$
359

March 24, 2016 to September 30, 2016 - Successor
(12
)
 
(42
)
 
(55
)
 
(16
)
 
34

 
(91
)
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 19 — Supplemental Financial Information for total utility taxes for the nine months ended September 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 nine months ended September 30, 2017 and 2016 is as follows:
Three Months Ended September 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
$
4,042

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(295
)
 
$
3,747

Competitive businesses natural gas revenues
460

 
—

 
—

 
—

 
—

 
—

 
—

 
460

Competitive businesses other revenues
249

 
—

 
—

 
—

 
—

 
—

 
—

 
249

Rate-regulated electric revenues
—

 
1,571

 
662

 
658

 
1,280

 
—

 
(7
)
 
4,164

Rate-regulated natural gas revenues
—

 
—

 
53

 
80

 
18

 
—

 
(2
)
 
149

Shared service and other revenues
—

 
—

 
—

 
—

 
12

 
446

 
(458
)
 
—

2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
4,322

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(499
)
 
$
3,823

Competitive businesses natural gas revenues
326

 
—

 
—

 
—

 
—

 
—

 
—

 
326

Competitive businesses other revenues
387

 
—

 
—

 
—

 
—

 
—

 
(1
)
 
386

Rate-regulated electric revenues
—

 
1,497

 
740

 
735

 
1,366

 
—

 
(8
)
 
4,330

Rate-regulated natural gas revenues
—

 
—

 
48

 
77

 
17

 
—

 
(5
)
 
137

Shared service and other revenues
—

 
—

 
—

 
—

 
11

 
362

 
(373
)
 
—

Intersegment revenues(e):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
$
294

 
$
3

 
$
2

 
$
3

 
$
12

 
$
445

 
$
(759
)
 
$
—

2016
500

 
4

 
2

 
7

 
11

 
362

 
(885
)
 
1

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
 
 
 

2017
$
348

 
$
189

 
$
112

 
$
62

 
$
153

 
$
3

 
$
—

 
$
867

2016
271

 
37

 
122

 
56

 
166

 
(125
)
 
(1
)
 
526

Total assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 

September 30, 2017
$
47,744

 
$
29,649

 
$
11,480

 
$
8,923

 
$
21,301

 
$
10,662

 
$
(11,286
)
 
$
118,473

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 September 30, 2017 include revenue from sales to PECO of $31 million, sales to BGE of $98 million, sales to Pepco of $57 million, sales to DPL of $47 million, and sales to ACE of $7 million in the Mid-Atlantic region, and sales to ComEd of $54 million in the Midwest region. For the three months ended September 30, 2016, intersegment revenues for Generation include revenue from sales to PECO of $91 million, sales to BGE of $183 million, sales to Pepco of $128 million, sales to DPL of $63 million, and sales to ACE of $15 million in the Mid-Atlantic region, and sales to ComEd of $20 million in the Midwest region.
(b)
Amounts included represent activity for PHI's successor period, three months ended September 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 19 — Supplemental Financial Information for total utility taxes for the three months ended September 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 September 30, 2017 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
604

 
$
309

 
$
370

 
$
—

 
$
(3
)
 
$
1,280

Rate-regulated natural gas revenues
—

 
18

 
—

 
—

 
—

 
18

Shared service and other revenues
—

 
—

 
—

 
12

 
—

 
12

Three Months Ended September 30, 2016 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
635

 
$
314

 
$
421

 
$
—

 
$
(4
)
 
$
1,366

Rate-regulated natural gas revenues
—

 
17

 
—

 
—

 
—

 
17

Shared service and other revenues
—

 
—

 
—

 
11

 
—

 
11

Intersegment revenues:
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017 - Successor
$
1

 
$
2

 
$
—

 
$
13

 
$
(4
)
 
$
12

Three Months Ended September 30, 2016 - Successor
1

 
2

 
1

 
11

 
(4
)
 
11

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017 - Successor
$
87

 
$
31

 
$
41

 
$
(18
)
 
$
12

 
$
153

Three Months Ended September 30, 2016 - Successor
79

 
44

 
47

 
(15
)
 
11

 
166

Total assets:
 
 
 
 
 
 
 
 
 
 
 
September 30, 2017 - Successor
$
7,775

 
$
4,276

 
$
3,510

 
$
10,724

 
$
(4,984
)
 
$
21,301

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 19 — Supplemental Financial Information for total utility taxes for the three months ended September 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:
 
Nine Months Ended September 30, 2017
 
Nine Months Ended September 30, 2016
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
Mid-Atlantic
$
4,207

 
$
15

 
$
4,222

 
$
4,776

 
$
(40
)
 
$
4,736

Midwest
3,158

 
(17
)
 
3,141

 
3,330

 
13

 
3,343

New England
1,469

 
(8
)
 
1,461

 
1,278

 
(6
)
 
1,272

New York
1,095

 
(14
)
 
1,081

 
906

 
(33
)
 
873

ERCOT
749

 
4

 
753

 
659

 
6

 
665

Other Power Regions
807

 
(28
)
 
779

 
728

 
(42
)
 
686

Total Revenues for Reportable Segments
11,485


(48
)

11,437


11,677


(102
)

11,575

Other(b)
2,327

 
48

 
2,375

 
1,686

 
102

 
1,788

Total Generation Consolidated Operating Revenues
$
13,812


$
—


$
13,812


$
13,363


$
—


$
13,363

_________
(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 $30 million and $10 million decrease to revenues for the amortization of intangible assets and liabilities related to commodity contracts recorded at fair value for the nine months ended September 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $47 million and $366 million for the nine months ended September 30, 2017 and 2016, respectively, and elimination of intersegment revenues.
Generation total revenues net of purchased power and fuel expense:
 
Nine Months Ended September 30, 2017
 
Nine Months Ended September 30, 2016
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
Mid-Atlantic
$
2,330

 
$
81

 
$
2,411

 
$
2,541

 
$
15

 
$
2,556

Midwest
2,129

 
11

 
2,140

 
2,225

 
4

 
2,229

New England
423

 
(20
)
 
403

 
373

 
(23
)
 
350

New York
679

 
(1
)
 
678

 
607

 
(15
)
 
592

ERCOT
446

 
(188
)
 
258

 
335

 
(104
)
 
231

Other Power Regions
359

 
(139
)
 
220

 
357

 
(104
)
 
253

Total Revenues net of purchased power and fuel expense for Reportable Segments
6,366


(256
)

6,110


6,438


(227
)

6,211

Other(b)
160

 
256

 
416

 
316

 
227

 
543

Total Generation Revenues net of purchased power and fuel expense
$
6,526


$
—


$
6,526


$
6,754


$
—


$
6,754

_________
(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 $41 million and $15 million decrease to RNF for the amortization of intangible assets and liabilities related to commodity contracts for the nine months ended September 30, 2017 and 2016, respectively, unrealized mark-to-market losses of $161 million and $113 million for the nine months ended September 30, 2017 and 2016, respectively, accelerated nuclear fuel amortization associated with announced early plant retirements as discussed in Note 7 - Early Nuclear Plant Retirements of the Combined Notes to Consolidated Financial Statements of $8 million and $38 million decrease to revenue net of purchased power and fuel expense for the nine months ended September 30, 2017 and 2016, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.
Generation total revenues:
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017
 
Three Months Ended September 30, 2016
 
Revenues
from external
customers(a)

Intersegment
revenues

Total
Revenues

Revenues
from external
customers(a)

Intersegment
revenues

Total
Revenues
Mid-Atlantic
$
1,421

 
$
11

 
$
1,432

 
$
1,813

 
$
(13
)
 
$
1,800

Midwest
1,049

 
(11
)
 
1,038

 
1,163

 
1

 
1,164

New England
482

 
(1
)
 
481

 
455

 
(4
)
 
451

New York
434

 
(6
)
 
428

 
331

 
(8
)
 
323

ERCOT
308

 
6

 
314

 
289

 
6

 
295

Other Power Regions
348

 
(13
)
 
335

 
271

 
(33
)
 
238

Total Revenues for Reportable Segments
4,042

 
(14
)
 
4,028

 
4,322

 
(51
)
 
4,271

Other(b)
709

 
14

 
723

 
713

 
51

 
764

Total Generation Consolidated Operating Revenues
$
4,751

 
$
—

 
$
4,751

 
$
5,035

 
$
—

 
$
5,035

_________
(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 $13 million and $21 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 September 30, 2017 and 2016, respectively, unrealized mark-to-market gain of $52 million and $187 million for the three months ended September 30, 2017 and 2016, respectively, and elimination of intersegment revenues.
Generation total revenues net of purchased power and fuel expense:
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30, 2017
 
Three Months Ended September 30, 2016
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total RNF
Mid-Atlantic
$
817

 
$
38

 
$
855

 
$
881

 
$
6

 
$
887

Midwest
697

 
—

 
697

 
782

 
(1
)
 
781

New England
151

 
(6
)
 
145

 
170

 
(10
)
 
160

New York
296

 
—

 
296

 
195

 
(1
)
 
194

ERCOT
229

 
(111
)
 
118

 
144

 
(51
)
 
93

Other Power Regions
118

 
(50
)
 
68

 
143

 
(66
)
 
77

Total Revenues net of purchased power and fuel for Reportable Segments
2,308


(129
)

2,179


2,315


(123
)

2,192

Other(b)
112

 
129

 
241

 
131

 
123

 
254

Total Generation Revenues net of purchased power and fuel expense
$
2,420


$
—


$
2,420


$
2,446


$
—


$
2,446


_________
(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 $19 million and $22 million decrease to RNF for the amortization of intangible assets and liabilities related to commodity contracts for the three months ended September 30, 2017 and 2016, respectively, unrealized mark-to-market gains of $73 million and $88 million for the three months ended September 30, 2017 and 2016, respectively, accelerated nuclear fuel amortization associated with announced early plant retirements as discussed in Note 7 - Early Nuclear Plant Retirements of the Combined Notes to Consolidated Financial Statements of $6 million and $28 million decrease to revenue net of purchased power and fuel expense for the three months ended September 30, 2017 and 2016, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.