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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—generation
3-56
 
$
27,193

 
$
25,615

Nuclear fuel (a)
1-8
 
6,546

 
6,384

Construction work in progress
N/A
 
2,332

 
2,017

Other property, plant and equipment (b)
4
 
76

 
466

Total property, plant and equipment
 
 
36,147

 
34,482

Less: accumulated depreciation (c)
 
 
10,562

 
8,639

Property, plant and equipment, net
 
 
$
25,585

 
$
25,843

_________________________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,326 million and $1,266 million at December 31, 2016 and 2015, respectively.
(b)
Includes buildings under capital lease with a net carrying value of $10 million and $13 million at December 31, 2016 and 2015, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $42 million and $39 million, as of December 31, 2016 and 2015, respectively. At December 31, 2015 these balances also include capitalized acquisition, development and exploration costs of $266 million related to oil and gas production activities at Generation, see Note 4—Mergers, Acquisitions, and Dispositions for additional information regarding the sale of upstream assets. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $17 million and $146 million at December 31, 2016 and 2015, respectively. See Note 8 —Impairment of Long-Lived Assets for additional information on the impairment of Generations turbine equipment.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core of $3,186 million and $2,861 million as of December 31, 2016 and 2015, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-80
 
$
22,636

 
$
20,576

Construction work in progress
N/A
 
569

 
572

Other property, plant and equipment (a), (b)
37-50
 
67

 
64

Total property, plant and equipment
 
 
23,272

 
21,212

Less: accumulated depreciation
 
 
3,937

 
3,710

Property, plant and equipment, net
 
 
$
19,335

 
$
17,502

_________________________
(a)
Includes buildings under capital lease with a net carrying value at both December 31, 2016 and 2015 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, 2016 and 2015.
(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, 2016 and 2015:
 
 
Average Service life
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-68
 
$
3,574

 
$
3,431

Gas—distribution
5-75
 
580

 
547

Common—electric and gas
4-40
 
115

 
108

Construction work in progress
N/A
 
163

 
107

Other property, plant and equipment (a)
10-43
 
16

 
16

Total property, plant and equipment
 
 
4,448



4,209

Less: accumulated depreciation
 
 
1,175

—

1,139

Property, plant and equipment, net
 
 
$
3,273



$
3,070


_______________________
(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, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-86
 
$
8,018

 
$
7,682

Construction work in progress
N/A
 
537

 
318

Other property, plant and equipment (a)
10-33
 
66

 
91

Total property, plant and equipment
 
 
8,621



8,091

Less: accumulated depreciation
 
 
3,050

—

2,929

Property, plant and equipment, net
 
 
$
5,571



$
5,162

_______________________
(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, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-65
 
$
7,591

 
$
7,230

Gas—transportation and distribution
5-70
 
2,348

 
2,206

Common—electric and gas
5-50
 
670

 
631

Construction work in progress
N/A
 
188

 
154

Other property, plant and equipment (a)
50
 
21

 
21

Total property, plant and equipment
 
 
10,818

 
10,242

Less: accumulated depreciation
 
 
3,253

 
3,101

Property, plant and equipment, net
 
 
$
7,565

 
$
7,141

_________________________
(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, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
45,698

 
$
32,546

Electric—generation
3-56
 
27,193

 
25,615

Gas—transportation and distribution
5-90
 
4,642

 
3,864

Common—electric and gas
4-50
 
1,312

 
1,149

Nuclear fuel (a)
1-8
 
6,546

 
6,384

Construction work in progress
N/A
 
4,306

 
3,075

Other property, plant and equipment (b)
3-50
 
1,027

 
1,181

Total property, plant and equipment
 
 
90,724

 
73,814

Less: accumulated depreciation (c)
 
 
19,169

 
16,375

Property, plant and equipment, net
 
 
$
71,555

 
$
57,439

_________________________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,326 million and $1,266 million at December 31, 2016 and 2015, respectively.
(b)
Includes Generation’s buildings under capital lease with a net carrying value of $10 million and $13 million at December 31, 2016 and 2015, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $42 million and $39 million, as of December 31, 2016 and 2015, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at both December 31, 2016 and 2015, 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, 2016 and 2015. Includes land held for future use and non utility property at ComEd, PECO, BGE, Pepco, DPL, and ACE of $60 million, $21 million, $32 million, $66 million, $16 million, and $27 million, respectively, at December 31, 2016. At December 31, 2015 these balances also include capitalized acquisition, development and exploration costs of $266 million related to oil and gas production activities at Generation, see Note 4—Mergers, Acquisitions, and Dispositions for additional information regarding the sale of upstream assets. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $17 million and $146 million at December 31, 2016 and 2015, respectively. See Note 8 —Impairment of Long-Lived Assets for additional information on the impairment of Generations turbine equipment.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $3,186 million and $2,861 million as of December 31, 2016 and 2015, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2016 and 2015:

 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-55
 
$
3,341

 
$
3,105

Construction work in progress
N/A
 
169

 
158

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

 
28

Total property, plant and equipment
 
 
3,537



3,291

Less: accumulated depreciation
 
 
1,016

—

969

Property, plant and equipment, net
 
 
$
2,521



$
2,322

_______________________
(a)
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2016 and 2015:
 
 
 
 
Successor
 
Predecessor
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-86
 
$
10,315

 
$
14,563

Gas—distribution
5-75
 
414

 
547

Common—electric and gas
4-40
 
65

 
164

Construction work in progress
N/A
 
892

 
591

Other property, plant and equipment (a)
3-43
 
107

 
339

Total property, plant and equipment
 
 
11,793



16,204

Less: accumulated depreciation
 
 
195

—

5,340

Property, plant and equipment, net
 
 
$
11,598



$
10,864

_______________________
(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, 2016 and 2015:
 
 
Average 
Service Life
(years)
 
2016
 
2015
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
7,067

 
$
6,663

Gas—distribution
5-90
 
2,170

 
1,951

Common—electric and gas
5-40
 
707

 
655

Construction work in progress
N/A
 
318

 
312

Other property, plant and equipment (a)
20
 
32

 
32

Total property, plant and equipment
 
 
10,294

 
9,613

Less: accumulated depreciation
 
 
3,254

 
3,016

Property, plant and equipment, net
 
 
$
7,040

 
$
6,597

_______________________
(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
2016
 
2015
 
2014
Electric—transmission and distribution
2.32
%
 
2.39
%
 
2.55
%
Gas
1.82
%
 
1.87
%
 
1.84
%
Common—electric and gas
5.11
%
 
5.16
%
 
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
2016
 
2015
 
2014
Electric—transmission and distribution
2.49
%
 
2.44
%
 
2.41
%
Gas
2.57
%
 
2.55
%
 
2.48
%
Common—electric and gas
4.99
%
 
4.24
%
 
4.08
%
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
2016
 
2015
 
2014
Electric—transmission and distribution
2.56
%
 
2.62
%
 
2.96
%
Gas
2.45
%
 
2.50
%
 
2.47
%
Common—electric and gas
9.45
%
 
10.35
%
 
9.49
%
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
2016
 
2015
 
2014
Electric—transmission and distribution
2.52
%
 
2.48
%
 
2.42
%
Gas
2.57
%
 
2.55
%
 
2.48
%
Common—electric and gas
8.12
%
 
5.19
%
 
4.55
%
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
2016
 
2015
 
2014
Electric—transmission and distribution
2.73
%
 
2.83
%
 
2.93
%
Electric—generation
5.94
%
(a) 
3.47
%
 
3.50
%
Gas
2.17
%
 
2.17
%
 
2.13
%
Common—electric and gas
7.41
%
 
7.79
%
 
7.32
%