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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment
Exelon
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
53,090

 
$
49,506

Electric—generation
1-56
 
29,170

 
29,019

Gas—transportation and distribution
5-90
 
5,530

 
5,050

Common—electric and gas
5-75
 
1,627

 
1,447

Nuclear fuel (a)
1-8
 
5,957

 
6,420

Construction work in progress
N/A
 
3,377

 
2,825

Other property, plant and equipment (b)
1-50
 
858

 
999

Total property, plant and equipment
 
 
99,609

 
95,266

Less: accumulated depreciation (c)
 
 
22,902

 
21,064

Property, plant and equipment, net
 
 
$
76,707

 
$
74,202

__________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,004 million and $1,196 million at December 31, 2018 and 2017, respectively.
(b)
Includes Generation’s buildings under capital lease with a net carrying value of $5 million and $7 million at December 31, 2018 and 2017, respectively. The original cost basis of the buildings was $47 million as of both December 31, 2018 and 2017, and total accumulated amortization was $42 million and $40 million, as of December 31, 2018 and 2017, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at both December 31, 2018 and 2017, of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2018 and 2017. Includes land held for future use and non-utility property at ComEd, PECO, BGE, Pepco, DPL and ACE of $39 million, $19 million, $25 million, $61 million, $17 million and $28 million, respectively, at December 31, 2018.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $2,969 million and $3,159 million as of December 31, 2018 and 2017, respectively.

Generation
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—generation
1-56
 
$
29,170

 
$
29,019

Nuclear fuel (a)
1-8
 
5,957

 
6,420

Construction work in progress
N/A
 
997

 
838

Other property, plant and equipment (b)
1-8
 
63

 
57

Total property, plant and equipment
 
 
36,187

 
36,334

Less: accumulated depreciation (c)
 
 
12,206

 
11,428

Property, plant and equipment, net
 
 
$
23,981

 
$
24,906

__________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,004 million and $1,196 million at December 31, 2018 and 2017, respectively.
(b)
Includes buildings under capital lease with a net carrying value of $5 million and $7 million at December 31, 2018 and 2017, respectively. The original cost basis of the buildings was $47 million as of both December 31, 2018 and 2017, and total accumulated amortization was $42 million and $40 million, as of December 31, 2018 and 2017, respectively.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core of $2,969 million and $3,159 million as of December 31, 2018 and 2017, respectively.
    
ComEd
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-80
 
$
25,991

 
$
24,423

Construction work in progress
N/A
 
705

 
517

Other property, plant and equipment (a), (b)
35-50
 
46

 
52

Total property, plant and equipment
 
 
26,742

 
24,992

Less: accumulated depreciation
 
 
4,684

 
4,269

Property, plant and equipment, net
 
 
$
22,058

 
$
20,723

__________
(a)
Includes buildings under capital lease with a net carrying value at both December 31, 2018 and 2017 of $7 million. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million as of both December 31, 2018 and 2017.
(b)
Represents land held for future use and non-utility property.

PECO
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-65
 
$
8,359

 
$
7,975

Gas—transportation and distribution
5-70
 
2,694

 
2,504

Common—electric and gas
5-50
 
756

 
710

Construction work in progress
N/A
 
343

 
254

Other property, plant and equipment (a)
50
 
19

 
21

Total property, plant and equipment
 
 
12,171

 
11,464

Less: accumulated depreciation
 
 
3,561

 
3,411

Property, plant and equipment, net
 
 
$
8,610

 
$
8,053

__________
(a)
Represents land held for future use and non-utility property.

BGE
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
7,951

 
$
7,464

Gas—distribution
5-90
 
2,630

 
2,379

Common—electric and gas
5-40
 
860

 
771

Construction work in progress
N/A
 
410

 
367

Other property, plant and equipment (a)
20
 
25

 
26

Total property, plant and equipment
 
 
11,876

 
11,007

Less: accumulated depreciation
 
 
3,633

 
3,405

Property, plant and equipment, net
 
 
$
8,243

 
$
7,602

__________
(a)
Represents plant held for future use and non-utility property.

PHI
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-75
 
$
12,664

 
$
11,517

Gas—distribution
5-75
 
486

 
449

Common—electric and gas
5-75
 
126

 
82

Construction work in progress
N/A
 
912

 
835

Other property, plant and equipment (a)
3-43
 
99

 
102

Total property, plant and equipment
 
 
14,287


12,985

Less: accumulated depreciation
 
 
841

 
487

Property, plant and equipment, net
 
 
$
13,446


$
12,498

__________
(a)
Represents plant held for future use and non-utility property.

Pepco
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-75
 
$
9,217

 
$
8,646

Construction work in progress
N/A
 
536

 
473

Other property, plant and equipment (a)
25-33
 
61

 
59

Total property, plant and equipment
 
 
9,814


9,178

Less: accumulated depreciation
 
 
3,354

 
3,177

Property, plant and equipment, net
 
 
$
6,460


$
6,001

__________
(a)
Represents plant held for future use and non-utility property.

DPL
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-70
 
$
4,195

 
$
3,875

Gas—distribution
5-75
 
651

 
614

Common—electric and gas
5-75
 
136

 
117

Construction work in progress
N/A
 
151

 
205

Other property, plant and equipment (a)
10-43
 
17

 
15

Total property, plant and equipment
 
 
5,150


4,826

Less: accumulated depreciation
 
 
1,329

 
1,247

Property, plant and equipment, net
 
 
$
3,821


$
3,579

__________
(a)
Represents plant held for future use and non-utility property.

ACE
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2018 and 2017:
 
Average 
Service Life
(years)
 
2018
 
2017
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-60
 
$
3,866

 
$
3,607

Construction work in progress
N/A
 
209

 
138

Other property, plant and equipment (a)
13-15
 
28

 
27

Total property, plant and equipment
 
 
4,103


3,772

Less: accumulated depreciation
 
 
1,137

 
1,066

Property, plant and equipment, net
 
 
$
2,966


$
2,706

__________
(a)
Represents plant held for future use and non-utility property.
Property Plant And Equipment Average Service Life Percentage By Asset Category Table
Exelon
The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category
2018
 
2017
 
2016
Electric—transmission and distribution
2.73
%
 
2.75
%
 
2.73
%
Electric—generation(a)
5.37
%
 
4.36
%
 
5.94
%
Gas
2.07
%
 
2.10
%
 
2.17
%
Common—electric and gas
6.98
%
 
7.05
%
 
7.41
%
__________
(a)
See Note 8 — Early Plant Retirements for additional information on the accelerated net depreciation and amortization of Clinton, Quad Cities, Oyster Creek and TMI.
    
PECO
The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category
2018
 
2017
 
2016
Electric—transmission and distribution
2.35
%
 
2.37
%
 
2.32
%
Gas
1.90
%
 
1.89
%
 
1.82
%
Common—electric and gas
5.44
%
 
5.47
%
 
5.11
%

BGE
The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category
2018
 
2017
 
2016
Electric—transmission and distribution
2.61
%
 
2.58
%
 
2.56
%
Gas
2.36
%
 
2.33
%
 
2.45
%
Common—electric and gas
8.50
%
 
8.64
%
 
9.45
%

PHI
The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category
2018
 
2017
 
2016
Electric—transmission and distribution
2.61
%
 
2.63
%
 
2.52
%
Gas
1.59
%
 
2.07
%
 
2.57
%
Common—electric and gas
6.30
%
 
6.50
%
 
8.12
%

DPL
The following table presents the annual depreciation provisions as a percentage of average service life for each asset category.
Average Service Life Percentage by Asset Category
2018
 
2017
 
2016
Electric—transmission and distribution
2.77
%
 
2.75
%
 
2.49
%
Gas
1.59
%
 
2.07
%
 
2.57
%
Common—electric and gas
3.70
%
 
4.14
%
 
4.99
%
Schedule Of Capitalized Software
Capitalized Software Costs (All Registrants)
The following tables presents net unamortized capitalized software costs and amortization of capitalized software costs by year.
Net unamortized software costs
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
December 31, 2018
$
810

 
$
164

 
$
206

 
$
98

 
$
166

 
$
165

 
$
26

 
$
21

 
$
14

December 31, 2017
834

 
173

 
227

 
111

 
179

 
133

 
2

 
1

 
1

Amortization of capitalized software costs
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE 
 
Pepco
 
DPL
 
ACE
2018
$
282

 
$
78

 
$
79

 
$
37

 
$
48

 
$
2

 
$
2

 
$
1

2017
270

 
73

 
73

 
39

 
46

 
—

 
—

 
—

2016
255

 
72

 
62

 
33

 
44

 
—

 
—

 
—

 
Successor
 
 
Predecessor
PHI
For the year ended December 31, 2018
 
For the year ended December 31, 2017
 
March 24, 2016 to December 31, 2016
 
 
January 1, 2016 to March 23, 2016
Amortization of capitalized software costs
$
33

 
$
34

 
$
29

 
 
$
8
Schedule Of Capitalized Interest And AFUDC
Capitalized Interest and AFUDC (All Registrants)
The following table summarizes total incurred interest, capitalized interest and credits to AFUDC by year:
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
Pepco
 
DPL
 
ACE
2018
Total incurred interest(a)
$
1,695

 
$
464

 
$
377

 
$
141

 
$
130

 
$
162

 
$
62

 
$
68

 
Capitalized interest
31

 
31

 
—

 
—

 
—

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
109

 
—

 
30

 
12

 
24

 
34

 
4

 
4

2017
Total incurred interest(a)
$
1,658

 
$
502

 
$
369

 
$
130

 
$
111

 
$
133

 
$
54

 
$
64

 
Capitalized interest
63

 
63

 
—

 
—

 
—

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
108

 
—

 
20

 
12

 
22

 
34

 
10

 
9

2016
Total incurred interest(a)
$
1,678

 
$
472

 
$
469

 
$
127

 
$
114

 
$
137

 
$
52

 
$
65

 
Capitalized interest
108

 
107

 
—

 
—

 
—

 
—

 
—

 
—

 
Credits to AFUDC debt and equity
98

 
—

 
22

 
11

 
30

 
29

 
7

 
9

 
Successor
 
 
Predecessor
PHI
For the year ended December 31, 2018
 
For the year ended December 31, 2017
 
March 24, 2016 to December 31, 2016
 
 
January 1, 2016 to March 23, 2016
Total incurred interest(a)
$
305

 
$
263

 
$
207

 
 
$
68

Credits to AFUDC debt and equity
44

 
54

 
35

 
 
10

__________
(a)
Includes interest expense to affiliates.