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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment | We depreciate property, plant and equipment over its estimated useful life by charging depreciation expense to net income as follows:
Asset | Basis | Estimated useful life
Buildings | Diminishing balance | 5 to 40 years
Cable and wireless network | Straight-line | 3 to 40 years
Computer equipment and software | Straight-line | 4 to 10 years
Customer premise equipment | Straight-line | 3 to 5 years
Leasehold improvements | Straight-line | Over shorter of estimated useful life or lease term
Equipment and vehicles | Diminishing balance | 3 to 20 years
(In millions of dollars) | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
| Cost |  | Accumulated depreciation |  | Net carrying amount |  | Cost |  | Accumulated depreciation |  | Net carrying amount |  | Cost |  | Accumulated depreciation |  | Net carrying amount |
Land and buildings | 1,090 |  | (397 | ) | 693 |  | 1,062 |  | (375 | ) | 687 |  | 998 |  | (347 | ) | 651 |
Cable and wireless networks | 20,252 |  | (13,206 | ) | 7,046 |  | 20,108 |  | (13,035 | ) | 7,073 |  | 20,900 |  | (13,579 | ) | 7,321 |
Computer equipment and software | 4,996 |  | (2,807 | ) | 2,189 |  | 4,296 |  | (2,424 | ) | 1,872 |  | 5,294 |  | (3,421 | ) | 1,873 |
Customer premise equipment | 1,565 |  | (1,090 | ) | 475 |  | 1,560 |  | (1,156 | ) | 404 |  | 1,658 |  | (1,197 | ) | 461 |
Leasehold improvements | 496 |  | (220 | ) | 276 |  | 457 |  | (193 | ) | 264 |  | 423 |  | (175 | ) | 248 |
Equipment and vehicles | 1,246 |  | (782 | ) | 464 |  | 1,169 |  | (720 | ) | 449 |  | 1,311 |  | (868 | ) | 443 |
Total property, plant and equipment | 29,645 |  | (18,502 | ) | 11,143 |  | 28,652 |  | (17,903 | ) | 10,749 |  | 30,584 |  | (19,587 | ) | 10,997 |
The tables below summarize the changes in the net carrying amounts of property, plant and equipment during 2017 and 2016.
(In millions of dollars) | December 31, 2016 | December 31, 2017 |
| Net carrying amount |  | Additions 1 |  | Depreciation |  | Other 2 |  | Net carrying amount |
Land and buildings | 687 |  | 61 |  | (30 | ) | (25 | ) | 693 |
Cable and wireless networks | 7,073 |  | 1,125 |  | (1,150 | ) | (2 | ) | 7,046 |
Computer equipment and software | 1,872 |  | 867 |  | (549 | ) | (1 | ) | 2,189 |
Customer premise equipment | 404 |  | 315 |  | (244 | ) | — |  | 475 |
Leasehold improvements | 264 |  | 40 |  | (28 | ) | — |  | 276 |
Equipment and vehicles | 449 |  | 102 |  | (86 | ) | (1 | ) | 464 |
Total property, plant and equipment | 10,749 |  | 2,510 |  | (2,087 | ) | (29 | ) | 11,143 |
1 | Excludes proceeds on disposition of $74 million (see note 28).
2 | Includes disposals, reclassifications, and other adjustments.
(In millions of dollars) | December 31, 2015 | December 31, 2016 |
| Net carrying amount |  | Additions |  | Depreciation |  | Impairment |  | Other 1 |  | Net carrying amount |
Land and buildings | 651 |  | 64 |  | (28 | ) | — |  | — |  | 687 |
Cable and wireless networks | 7,321 |  | 1,173 |  | (1,216 | ) | (205 | ) | — |  | 7,073 |
Computer equipment and software | 1,873 |  | 732 |  | (522 | ) | (207 | ) | (4 | ) | 1,872 |
Customer premise equipment | 461 |  | 240 |  | (296 | ) | — |  | (1 | ) | 404 |
Leasehold improvements | 248 |  | 46 |  | (30 | ) | — |  | — |  | 264 |
Equipment and vehicles | 443 |  | 97 |  | (91 | ) | — |  | — |  | 449 |
Total property, plant and equipment | 10,997 |  | 2,352 |  | (2,183 | ) | (412 | ) | (5 | ) | 10,749 |
1 | Includes disposals, reclassifications, and other adjustments.
Disclosure of impairment of assets and related onerous contract charges |
(In millions of dollars) |  | Year ended December 31, 2016 |
Impairment of property, plant and equipment |  | 412 |
Onerous contracts and other |  | 72 |
Total impairment of assets and related onerous contract charges |  | 484 |

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