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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
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:
AssetBasisEstimated useful life
BuildingsDiminishing balance
5 to 40 years
Cable and wireless networkStraight-line
3 to 40 years
Computer equipment and softwareStraight-line
4 to 10 years
Customer premise equipmentStraight-line
3 to 6 years
Leasehold improvementsStraight-line
Over shorter of estimated useful life or lease term
Equipment and vehiclesDiminishing 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, 2020December 31, 2019December 31, 2018
 CostAccumulated depreciationNet carrying amountCostAccumulated depreciationNet carrying amountCostAccumulated depreciationNet carrying amount
  
Land and buildings1,212 (496)716 1,182 (461)721 1,125 (428)697 
Cable and wireless networks22,357 (14,268)8,089 21,778 (13,814)7,964 21,024 (13,550)7,474 
Computer equipment and software6,361 (4,253)2,108 5,903 (3,749)2,154 5,514 (3,305)2,209 
Customer premise equipment1,976 (1,515)461 1,963 (1,387)576 1,908 (1,279)629 
Leasehold improvements625 (313)312 596 (281)315 539 (250)289 
Equipment and vehicles1,320 (839)481 1,244 (776)468 1,292 (810)482 
   
Property, plant and equipment33,851 (21,684)12,167 32,666 (20,468)12,198 31,402 (19,622)11,780 
Right-of-use assets2,248 (397)1,851 1,911 (175)1,736 — — — 
Total36,099 (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, 2019December 31, 2020
 
Net carrying
amount
AdditionsAcquisitions from business combinationsDepreciation
Disposals and other
Net carrying
amount
   
Land and buildings721 30 — (37)2 716 
Cable and wireless networks7,964 1,334 4 (1,196)(17)8,089 
Computer equipment and software2,154 653 37 (747)11 2,108 
Customer premise equipment576 165 — (288)8 461 
Leasehold improvements315 32 1 (36)— 312 
Equipment and vehicles468 98 1 (86)— 481 
 
Property, plant and equipment12,198 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 equipment13,934 2,649 43 (2,607)(1)14,018 
(In millions of dollars)December 31, 2018December 31, 2019
 
Net carrying
amount
Effect of IFRS 16 transition
Additions 1
DepreciationDisposals and otherNet carrying amount
  
Land and buildings697 — 57 (34)1 721 
Cable and wireless networks7,474 (95)1,739 (1,157)3 7,964 
Computer equipment and software2,209 — 644 (706)7 2,154 
Customer premise equipment629 — 236 (292)3 576 
Leasehold improvements289 — 60 (33)(1)315 
Equipment and vehicles482 — 109 (75)(48)468 
 
Property, plant and equipment11,780 (95)2,845 (2,297)(35)12,198 
Right-of-use assets (note 8)— 1,576 335 (175)— 1,736 
Total property, plant and equipment11,780 1,481 3,180 (2,472)(35)13,934 
1    Excludes proceeds on disposition of $38 million (see note 29).