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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—generation
2-56
 
$
29,019

 
$
27,193

Nuclear fuel (a)
1-8
 
6,420

 
6,546

Construction work in progress
N/A
 
838

 
2,332

Other property, plant and equipment (b)
2-3
 
57

 
76

Total property, plant and equipment
 
 
36,334

 
36,147

Less: accumulated depreciation (c)
 
 
11,428

 
10,562

Property, plant and equipment, net
 
 
$
24,906

 
$
25,585

__________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,196 million and $1,326 million at December 31, 2017 and 2016, respectively.
(b)
Includes buildings under capital lease with a net carrying value of $7 million and $10 million at December 31, 2017 and 2016, respectively. The original cost basis of the buildings was $47 million and $52 million, and total accumulated amortization was $40 million and $42 million, as of December 31, 2017 and 2016, respectively. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $0 million and $17 million as of December 31, 2017 and 2016, respectively. Generation's turbine equipment was impaired by $11 million and the remaining $6 million was moved to the assets held for sale account at December 31, 2017.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core of $3,159 million and $3,186 million as of December 31, 2017 and 2016, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
7,464

 
$
7,067

Gas—distribution
5-90
 
2,379

 
2,170

Common—electric and gas
5-40
 
771

 
707

Construction work in progress
N/A
 
367

 
318

Other property, plant and equipment (a)
20
 
26

 
32

Total property, plant and equipment
 
 
11,007

 
10,294

Less: accumulated depreciation
 
 
3,405

 
3,254

Property, plant and equipment, net
 
 
$
7,602

 
$
7,040

__________
(a)
Represents land held for future use and non-utility property
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-75
 
$
8,646

 
$
8,018

Construction work in progress
N/A
 
473

 
537

Other property, plant and equipment (a)
25-33
 
59

 
66

Total property, plant and equipment
 
 
9,178



8,621

Less: accumulated depreciation
 
 
3,177

—

3,050

Property, plant and equipment, net
 
 
$
6,001



$
5,571

__________
(a)
Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-60
 
$
3,607

 
$
3,341

Construction work in progress
N/A
 
138

 
169

Other property, plant and equipment (a)
13-15
 
27

 
27

Total property, plant and equipment
 
 
3,772



3,537

Less: accumulated depreciation
 
 
1,066

—

1,016

Property, plant and equipment, net
 
 
$
2,706



$
2,521

__________
(a)
Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-80
 
$
24,423

 
$
22,636

Construction work in progress
N/A
 
517

 
569

Other property, plant and equipment (a), (b)
36-50
 
52

 
67

Total property, plant and equipment
 
 
24,992

 
23,272

Less: accumulated depreciation
 
 
4,269

 
3,937

Property, plant and equipment, net
 
 
$
20,723

 
$
19,335

__________
(a)
Includes buildings under capital lease with a net carrying value at both December 31, 2017 and 2016 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, 2017 and 2016.
(b)
Includes land held for future use and non-utility property.
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-70
 
$
3,875

 
$
3,574

Gas—distribution
5-75
 
614

 
580

Common—electric and gas
5-75
 
117

 
115

Construction work in progress
N/A
 
205

 
163

Other property, plant and equipment (a)
10-43
 
15

 
16

Total property, plant and equipment
 
 
4,826



4,448

Less: accumulated depreciation
 
 
1,247

—

1,175

Property, plant and equipment, net
 
 
$
3,579



$
3,273


__________
(a)
Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
 
 
Successor
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-75
 
$
11,517

 
$
10,315

Gas—distribution
5-75
 
449

 
414

Common—electric and gas
5-75
 
82

 
65

Construction work in progress
N/A
 
835

 
892

Other property, plant and equipment (a)
3-43
 
102

 
107

Total property, plant and equipment
 
 
12,985



11,793

Less: accumulated depreciation
 
 
487

—

195

Property, plant and equipment, net
 
 
$
12,498



$
11,598

__________
(a)
Represents plant held for future use and non-utility property. Utility plant is generally subject to a first mortgage lien.
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
49,506

 
$
45,698

Electric—generation
2-56
 
29,019

 
27,193

Gas—transportation and distribution
5-90
 
5,050

 
4,642

Common—electric and gas
5-75
 
1,447

 
1,312

Nuclear fuel (a)
1-8
 
6,420

 
6,546

Construction work in progress
N/A
 
2,825

 
4,306

Other property, plant and equipment (b)
2-50
 
999

 
1,027

Total property, plant and equipment
 
 
95,266

 
90,724

Less: accumulated depreciation (c)
 
 
21,064

 
19,169

Property, plant and equipment, net
 
 
$
74,202

 
$
71,555

__________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,196 million and $1,326 million at December 31, 2017 and 2016, respectively.
(b)
Includes Generation’s buildings under capital lease with a net carrying value of $7 million and $10 million at December 31, 2017 and 2016, respectively. The original cost basis of the buildings was $47 million and $52 million, and total accumulated amortization was $40 million and $42 million, as of December 31, 2017 and 2016, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at both December 31, 2017 and 2016, 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, 2017 and 2016. Includes land held for future use and non-utility property at ComEd, PECO, BGE, Pepco, DPL and ACE of $44 million, $21 million, $26 million, $59 million, $15 million and $27 million, respectively, at December 31, 2017. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $0 million and $17 million as of December 31, 2017 and 2016, respectively. Generation's turbine equipment was impaired by $11 million and the remaining $6 million was moved to the assets held for sale account at December 31, 2017.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $3,159 million and $3,186 million as of December 31, 2017 and 2016, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2017 and 2016:
 
Average 
Service Life
(years)
 
2017
 
2016
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-65
 
$
7,975

 
$
7,591

Gas—transportation and distribution
5-70
 
2,504

 
2,348

Common—electric and gas
5-50
 
710

 
670

Construction work in progress
N/A
 
254

 
188

Other property, plant and equipment (a)
50
 
21

 
21

Total property, plant and equipment
 
 
11,464

 
10,818

Less: accumulated depreciation
 
 
3,411

 
3,253

Property, plant and equipment, net
 
 
$
8,053

 
$
7,565

__________
(a)
Represents land held for future use and non-utility property
Property Plant And Equipment Average Service Life Percentage By Asset Category Table
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
2017
 
2016
 
2015
Electric—transmission and distribution
2.75
%
 
2.49
%
 
2.44
%
Gas
2.07
%
 
2.57
%
 
2.55
%
Common—electric and gas
4.14
%
 
4.99
%
 
4.24
%
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
2017
 
2016
 
2015
Electric—transmission and distribution
2.58
%
 
2.56
%
 
2.62
%
Gas
2.33
%
 
2.45
%
 
2.50
%
Common—electric and gas
8.64
%
 
9.45
%
 
10.35
%
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
2017
 
2016
 
2015
Electric—transmission and distribution
2.37
%
 
2.32
%
 
2.39
%
Gas
1.89
%
 
1.82
%
 
1.87
%
Common—electric and gas
5.47
%
 
5.11
%
 
5.16
%
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
2017
 
2016
 
2015
Electric—transmission and distribution
2.63
%
 
2.52
%
 
2.48
%
Gas
2.07
%
 
2.57
%
 
2.55
%
Common—electric and gas
6.50
%
 
8.12
%
 
5.19
%
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
2017
 
2016
 
2015
Electric—transmission and distribution
2.75
%
 
2.73
%
 
2.83
%
Electric—generation(a)
4.36
%
(a) 
5.94
%
(a) 
3.47
%
Gas
2.10
%
 
2.17
%
 
2.17
%
Common—electric and gas
7.05
%
 
7.41
%
 
7.79
%

__________
(a)
See Note 8 — Early Nuclear Plant Retirements for additional information on the accelerated net depreciation and amortization of Clinton, Quad Cities and TMI.