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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014:
 
 
Average 
Service Life
(years)
 
2015
 
2014
Asset Category
 
 
 
 
 
Electric—generation
1-56
 
$
25,615

19,004,000,000

$
22,911

Nuclear fuel (a)
1-8
 
6,384

4,815,000,000

5,947

Construction work in progress
N/A
 
2,017

1,352,000,000

1,404

Other property, plant and equipment (b)
5-31
 
466

374,000,000

378

Total property, plant and equipment
 
 
34,482

 
30,640

Less: accumulated depreciation (c)
 
 
8,639

 
7,612

Property, plant and equipment, net
 
 
$
25,843

 
$
23,028

_________________________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,266 million and $1,003 million at December 31, 2015 and 2014, respectively.
(b)
Includes buildings under capital lease with a net carrying value of $13 million and $15 million at December 31, 2015 and 2014, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $39 million and $37 million, as of December 31, 2015 and 2014, respectively. These balances also include capitalized acquisition, development and exploration costs of $266 million and $242 million related to oil and gas production activities at Generation at December 31, 2015 and 2014, respectively. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $146 million and $83 million at December 31, 2015 and 2014, respectively.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core of $2,861 million and $2,673 million as of December 31, 2015 and 2014, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2015 and 2014:
 
 
Average 
Service Life
(years)
 
2015
 
2014
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
32,546

 
$
30,157

Electric—generation
1-56
 
25,615

 
22,911

Gas—transportation and distribution
5-90
 
3,864

 
3,505

Common—electric and gas
5-50
 
1,149

 
1,169

Nuclear fuel (a)
1-8
 
6,384

 
5,947

Construction work in progress
N/A
 
3,075

 
2,167

Other property, plant and equipment (b)
5-50
 
1,181

 
1,056

Total property, plant and equipment
 
 
73,814

 
66,912

Less: accumulated depreciation (c)
 
 
16,375

 
14,742

Property, plant and equipment, net
 
 
$
57,439

 
$
52,170

_________________________
(a)
Includes nuclear fuel that is in the fabrication and installation phase of $1,266 million and $1,003 million at December 31, 2015 and 2014, respectively.
(b)
Includes Generation’s buildings under capital lease with a net carrying value of $13 million and $15 million at December 31, 2015 and 2014, respectively. The original cost basis of the buildings was $52 million, and total accumulated amortization was $39 million and $37 million, as of December 31, 2015 and 2014, respectively. Also includes ComEd’s buildings under capital lease with a net carrying value at December 31, 2015 and 2014, of $7 million and $8 million, respectively. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million and $0.3 million as of December 31, 2015 and 2014, respectively. Includes land held for future use and non utility property at ComEd, PECO, and BGE of $57 million, $21 million, and $32 million, respectively. These balances also include capitalized acquisition, development and exploration costs of $266 million and $242 million related to oil and gas production activities at Generation at December 31, 2015 and 2014, respectively. Includes the original cost and progress payments associated with Generation’s turbine equipment held for future use with a carrying value of $146 million and $83 million at December 31, 2015 and 2014, respectively.
(c)
Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $2,861 million and $2,673 million as of December 31, 2015 and 2014, respectively
The following table presents a summary of property, plant and equipment by asset category as of December 31, 2015 and 2014:
 
 
Average 
Service Life
(years)
 
2015
 
2014
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-80
 
$
20,576

 
$
18,884

Construction work in progress
N/A
 
572

 
276

Other property, plant and equipment (a), (b)
38-50
 
64

 
65

Total property, plant and equipment
 
 
21,212

 
19,225

Less: accumulated depreciation
 
 
3,710

 
3,432

Property, plant and equipment, net
 
 
$
17,502

 
$
15,793

_________________________
(a)
Includes buildings under capital lease with a net carrying value at December 31, 2015 and 2014 of $7 million and $8 million, respectively. The original cost basis of the buildings was $8 million and total accumulated amortization was $1 million and $0.3 million as of December 31, 2015 and 2014, respectively.
(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, 2015 and 2014:
 
 
Average 
Service Life
(years)
 
2015
 
2014
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-90
 
$
6,663

 
$
6,339

Gas—distribution
5-90
 
1,951

 
1,761

Common—electric and gas
5-40
 
655

 
623

Construction work in progress
N/A
 
312

 
317

Other property, plant and equipment (a)
20
 
32

 
32

Total property, plant and equipment
 
 
9,613

 
9,072

Less: accumulated depreciation
 
 
3,016

 
2,868

Property, plant and equipment, net
 
 
$
6,597

 
$
6,204

_______________________
(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, 2015 and 2014:
 
 
Average 
Service Life
(years)
 
2015
 
2014
Asset Category
 
 
 
 
 
Electric—transmission and distribution
5-65
 
$
7,230

 
$
6,886

Gas—transportation and distribution
5-70
 
2,206

 
2,039

Common—electric and gas
5-50
 
631

 
618

Construction work in progress
N/A
 
154

 
154

Other property, plant and equipment (a)
50
 
21

 
21

Total property, plant and equipment
 
 
10,242

 
9,718

Less: accumulated depreciation
 
 
3,101

 
2,917

Property, plant and equipment, net
 
 
$
7,141

 
$
6,801

_________________________
(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
2015
 
2014
 
2013
Electric—transmission and distribution
2.83
%
 
2.93
%
 
2.91
%
Electric—generation
3.47
%
 
3.50
%
 
3.35
%
Gas
2.17
%
 
2.13
%
 
2.06
%
Common—electric and gas
7.79
%
 
7.32
%
 
7.53
%


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
2015
 
2014
 
2013
Electric—transmission and distribution
2.39
%
 
2.55
%
 
2.73
%
Gas
1.87
%
 
1.84
%
 
1.79
%
Common—electric and gas
5.16
%
 
5.16
%
 
6.65
%

Average Service Life Percentage by Asset Category
2015
 
2014
 
2013
Electric—transmission and distribution
2.62
%
 
2.96
%
 
2.91
%
Gas
2.50
%
 
2.47
%
 
2.36
%
Common—electric and gas
10.35
%
 
9.49
%
 
8.45
%