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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499596&loc=d3e42232-110370 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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