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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, plant and equipment [abstract]  
Schedule of Property, Plant and Equipment
The Group’s subsidiaries depreciate their property, plant and equipment, from the time they can be placed in service, amortizing the cost of the assets, net of their residual values on a straight-line basis over the assets’ estimated useful lives, which are calculated in accordance with technical studies that are revised periodically in light of technological advances and the rate of dismantling, as follows:
 
Years of estimated
useful life
Buildings
25  –  40
Plant and machinery
10  –  15
Telephone installations, networks and subscriber equipment
5  –  20
Furniture, tools and other items
2  –  10
The composition of and movement in the items comprising net “Property, plant and equipment” in 2017 and 2016 were the following:
2017
 

 

 

 

 

 

 

 

Millions of euros
Balance at 12/31/16

Additions

Depreciation

Disposals

Transfers and others

Translation
differences and
hyperinflation
adjustments

Inclusion
of companies

Balance at 12/31/17

Land and buildings
4,858

64

(391
)
(14
)
139

(293
)
20

4,383

Plant and machinery
26,770

2,096

(5,062
)
4

3,455

(2,039
)
73

25,297

Furniture, tools and other items
1,426

223

(500
)
(4
)
230

(117
)
9

1,267

PP&E in progress
3,339

4,496

—

(8
)
(4,237
)
(323
)
11

3,278

Total  PP&E
36,393

6,879

(5,953
)
(22
)
(413
)
(2,772
)
113

34,225

2016
 

 

 

 

 

 

 

 

Millions of euros
Balance at 12/31/15

Additions

Depreciation

Disposals

Transfers and others

Translation
differences and
hyperinflation
adjustments

Exclusion
of companies

Balance at 12/31/16

Land and buildings
4,851

59

(386
)
(36
)
198

173

(1
)
4,858

Plant and machinery
24,682

1,325

(5,034
)
(22
)
4,464

1,369

(14
)
26,770

Furniture, tools and other items
1,412

190

(531
)
(19
)
344

30

—

1,426

PP&E in progress
2,965

5,674

—

(12
)
(5,365
)
89

(12
)
3,339

Total  PP&E
33,910

7,248

(5,951
)
(89
)
(359
)
1,661

(27
)
36,393


The gross cost, accumulated depreciation and impairment losses of property, plant and equipment at December 31, 2017 and 2016 are as follows:
Balance at December 31, 2017
Millions of euros
Gross cost

Accumulated depreciation

Impairment losses

PP&E

Land and buildings
11,344

(6,958
)
(3
)
4,383

Plant and machinery
96,335

(70,969
)
(69
)
25,297

Furniture, tools and other items
6,900

(5,624
)
(9
)
1,267

PP&E in progress
3,289

—

(11
)
3,278

Total  PP&E
117,868

(83,551
)
(92
)
34,225

Balance at December 31, 2016
Millions of euros
Gross cost

Accumulated depreciation

Impairment losses

PP&E

Land and buildings
11,930

(7,069
)
(3
)
4,858

Plant and machinery
99,945

(73,021
)
(154
)
26,770

Furniture, tools and other items
7,288

(5,852
)
(10
)
1,426

PP&E in progress
3,350

—

(11
)
3,339

Total  PP&E
122,513

(85,942
)
(178
)
36,393