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Intangible Assets | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 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 |
Included in the cost of land, transmission and water rights as at December 31, 2016 was $138 million (December 31, 2015 - $106 million) not subject to amortization. Amortization expense related to intangible assets was $79 million for 2016 (2015 - $64 million). Amortization is estimated to average approximately $96 million annually for each of the next five years.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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