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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
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