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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2020
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 6 years
Leasehold improvements | Straight-line | Over shorter of estimated useful life or lease term
Equipment and vehicles | Diminishing balance | 3 to 20 years
The table below summarizes our property, plant and equipment as at December 31, 2020, 2019, and 2018.
(In millions of dollars) | December 31, 2020 | December 31, 2019 | December 31, 2018
| Cost | Accumulated depreciation | Net carrying amount | Cost | Accumulated depreciation | Net carrying amount | Cost | Accumulated depreciation | Net carrying amount
Land and buildings | 1,212 |  | (496) |  | 716 |  | 1,182 |  | (461) |  | 721 |  | 1,125 |  | (428) |  | 697 |
Cable and wireless networks | 22,357 |  | (14,268) |  | 8,089 |  | 21,778 |  | (13,814) |  | 7,964 |  | 21,024 |  | (13,550) |  | 7,474 |
Computer equipment and software | 6,361 |  | (4,253) |  | 2,108 |  | 5,903 |  | (3,749) |  | 2,154 |  | 5,514 |  | (3,305) |  | 2,209 |
Customer premise equipment | 1,976 |  | (1,515) |  | 461 |  | 1,963 |  | (1,387) |  | 576 |  | 1,908 |  | (1,279) |  | 629 |
Leasehold improvements | 625 |  | (313) |  | 312 |  | 596 |  | (281) |  | 315 |  | 539 |  | (250) |  | 289 |
Equipment and vehicles | 1,320 |  | (839) |  | 481 |  | 1,244 |  | (776) |  | 468 |  | 1,292 |  | (810) |  | 482 |
Property, plant and equipment | 33,851 |  | (21,684) |  | 12,167 |  | 32,666 |  | (20,468) |  | 12,198 |  | 31,402 |  | (19,622) |  | 11,780 |
Right-of-use assets | 2,248 |  | (397) |  | 1,851 |  | 1,911 |  | (175) |  | 1,736 |  | — |  | — |  | — |
Total | 36,099 |  | (22,081) |  | 14,018 |  | 34,577 |  | (20,643) |  | 13,934 |  | 31,402 |  | (19,622) |  | 11,780 |
The tables below summarize the changes in the net carrying amounts of property, plant and equipment during 2020 and 2019.
(In millions of dollars) | December 31, 2019 |  |  | December 31, 2020
| Net carrying amount | Additions | Acquisitions from business combinations | Depreciation |  | Disposals and other | Net carrying amount
Land and buildings | 721 |  | 30 |  | — |  | (37) |  |  | 2 |  | 716 |
Cable and wireless networks | 7,964 |  | 1,334 |  | 4 |  | (1,196) |  |  | (17) |  | 8,089 |
Computer equipment and software | 2,154 |  | 653 |  | 37 |  | (747) |  |  | 11 |  | 2,108 |
Customer premise equipment | 576 |  | 165 |  | — |  | (288) |  |  | 8 |  | 461 |
Leasehold improvements | 315 |  | 32 |  | 1 |  | (36) |  |  | — |  | 312 |
Equipment and vehicles | 468 |  | 98 |  | 1 |  | (86) |  |  | — |  | 481 |
Property, plant and equipment | 12,198 |  | 2,312 |  | 43 |  | (2,390) |  |  | 4 |  | 12,167 |
Right-of-use assets (note 8) | 1,736 |  | 337 |  | — |  | (217) |  |  | (5) |  | 1,851 |
Total property, plant and equipment | 13,934 |  | 2,649 |  | 43 |  | (2,607) |  |  | (1) |  | 14,018 |
(In millions of dollars) | December 31, 2018 |  |  |  | December 31, 2019
| Net carrying amount | Effect of IFRS 16 transition | Additions 1 |  | Depreciation |  | Disposals and other | Net carrying amount
Land and buildings | 697 |  | — |  | 57 |  |  | (34) |  |  | 1 |  | 721 |
Cable and wireless networks | 7,474 |  | (95) |  | 1,739 |  |  | (1,157) |  |  | 3 |  | 7,964 |
Computer equipment and software | 2,209 |  | — |  | 644 |  |  | (706) |  |  | 7 |  | 2,154 |
Customer premise equipment | 629 |  | — |  | 236 |  |  | (292) |  |  | 3 |  | 576 |
Leasehold improvements | 289 |  | — |  | 60 |  |  | (33) |  |  | (1) |  | 315 |
Equipment and vehicles | 482 |  | — |  | 109 |  |  | (75) |  |  | (48) |  | 468 |
Property, plant and equipment | 11,780 |  | (95) |  | 2,845 |  |  | (2,297) |  |  | (35) |  | 12,198 |
Right-of-use assets (note 8) | — |  | 1,576 |  | 335 |  |  | (175) |  |  | — |  | 1,736 |
Total property, plant and equipment | 11,780 |  | 1,481 |  | 3,180 |  |  | (2,472) |  |  | (35) |  | 13,934 |
1 Excludes proceeds on disposition of $38 million (see note 29).

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