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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of Public Utility Property, Plant, and Equipment
The service life ranges and weighted average remaining service life of the Corporation’s distribution, transmission, generation and other assets as at December 31 were as follows.

 
 
2016
2015
(Years)
Service Life Ranges
Weighted Average Remaining Service Life
 
Service Life Ranges
Weighted Average Remaining Service Life
Distribution
 
 
 
 
 
 
Electric
5-80
32
 
5-80
30
 
Gas
7-95
33
 
4-95
33
Transmission
 
 
 
 
 
 
Electric
20-80
41
 
20-80
29
 
Gas
7-80
34
 
7-80
36
Generation
5-85
26
 
5-85
27
Other
3-70
14
 
3-70
8
 
 
2016
(in millions)
Cost
 
Accumulated Depreciation
 
Net Book Value
Distribution
 
 
 
 
 
 
Electric
$
9,616

 
$
(2,752
)
 
$
6,864

 
Gas
3,956

 
(1,096
)
 
2,860

Transmission


 


 


 
Electric
12,616

 
(2,876
)
 
9,740

 
Gas
1,776

 
(562
)
 
1,214

Generation
6,884

 
(2,474
)
 
4,410

Other
3,497

 
(1,096
)
 
2,401

Assets under construction
1,559

 
—

 
1,559

Land
289

 
—

 
289

 
 
$
40,193

 
$
(10,856
)
 
$
29,337

10. UTILITY CAPITAL ASSETS (cont’d)

 
 
2015
(in millions)
Cost
 
Accumulated Depreciation
 
Net Book Value
Distribution
 
 
 
 
 
 
Electric
$
9,245

 
$
(2,634
)
 
$
6,611

 
Gas
3,829

 
(1,021
)
 
2,808

Transmission


 


 


 
Electric
3,093

 
(997
)
 
2,096

 
Gas
1,735

 
(531
)
 
1,204

Generation
6,465

 
(2,241
)
 
4,224

Other
2,429

 
(849
)
 
1,580

Assets under construction
886

 
—

 
886

Land
186

 
—

 
186

 
 
$
27,868

 
$
(8,273
)
 
$
19,595
Intangible Assets
The service life ranges and weighted average remaining service life of finite-life intangible assets as at December 31 were as follows.

 
 
2016
 
2015
(Years)
Service Life Ranges
Weighted Average Remaining Service Life
 
Service Life Ranges
Weighted Average Remaining Service Life
Computer software
3-10
4
 
3-10
4
Land, transmission and water rights
30-80
57
 
30-80
37
Other
10-104
15
 
10-104
15
 
2016
 
 
Accumulated
Net Book
(in millions)
Cost
Amortization
Value
Computer software
$
748

$
(447
)
$
301

Land, transmission and water rights
700

(108
)
592

Other
128

(56
)
72

Assets under construction
46

—

46

 
$
1,622

$
(611
)
$
1,011

 
 
 
 
 
2015
 
 
Accumulated
Net Book
(in millions)
Cost
Amortization
Value
Computer software
$
685

$
(436
)
$
249

Land, transmission and water rights
328

(76
)
252

Other
17

(13
)
4

Assets under construction
36

—

36

 
$
1,066

$
(525
)
$
541