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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2019
Property, plant and equipment [abstract]  
Disclosure of detailed information about property, plant and equipment
The table below summarizes our property, plant and equipment as at December 31, 2019, 2018, and 2017.
(In millions of dollars)
December 31, 2019
 
December 31, 2018
 
December 31, 2017
 
 
Cost

Accumulated depreciation

Net carrying amount

Cost

Accumulated depreciation

Net carrying amount

Cost

Accumulated depreciation

Net carrying amount

 
 
 
 

 
 
 

 
 
 
Land and buildings
1,182

(461
)
721

1,125

(428
)
697

1,090

(397
)
693

Cable and wireless networks
21,778

(13,814
)
7,964

21,024

(13,550
)
7,474

20,252

(13,206
)
7,046

Computer equipment and software
5,903

(3,749
)
2,154

5,514

(3,305
)
2,209

4,996

(2,807
)
2,189

Customer premise equipment
1,963

(1,387
)
576

1,908

(1,279
)
629

1,565

(1,090
)
475

Leasehold improvements
596

(281
)
315

539

(250
)
289

496

(220
)
276

Equipment and vehicles
1,244

(776
)
468

1,292

(810
)
482

1,246

(782
)
464

 
 
 
 

 
 
 

 
 
 
Property, plant and equipment
32,666

(20,468
)
12,198

31,402

(19,622
)
11,780

29,645

(18,502
)
11,143

Right-of-use assets
1,911

(175
)
1,736

—

—

—

—

—

—

 
 
 
 
 
 
 
 
 
 
Total
34,577

(20,643
)
13,934

31,402

(19,622
)
11,780

29,645

(18,502
)
11,143


The tables below summarize the changes in the net carrying amounts of property, plant and equipment during 2019 and 2018.
(In millions of dollars)
December 31, 2018

 
 
December 31, 2019
 
 
Net carrying
amount

Effect of IFRS 16 transition

Additions 1

Depreciation

Disposals and other 2

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).
2 
Includes disposals, reclassifications, and other adjustments.
(In millions of dollars)
December 31, 2017

 
December 31, 2018
 
 
Net carrying
amount

Additions 1

Depreciation

Disposals and other 2

Net carrying amount

 
 
 
 
 
 

Land and buildings
693

40

(32
)
(4
)
697

Cable and wireless networks
7,046

1,556

(1,128
)
—

7,474

Computer equipment and software
2,189

653

(633
)
—

2,209

Customer premise equipment
475

423

(269
)
—

629

Leasehold improvements
276

44

(31
)
—

289

Equipment and vehicles
464

99

(81
)
—

482

 
 
 
 
 
 
Total property, plant and equipment
11,143

2,815

(2,174
)
(4
)
11,780

1 
Excludes proceeds on disposition of $25 million (see note 29).
2 
Includes disposals, reclassifications, and other adjustments.
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