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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Indefinite-Lived Intangible Assets
 
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
Schedule of Finite-Lived 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