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v3.19.1

Costs (Details 3) - Number | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsidiaries [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 31,573 | 32,464 | 33,061
Subsidiaries [Member] | Senior Managers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 999 | 995 | 1,018
Subsidiaries [Member] | Junior Managers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 9,095 | 9,089 | 9,160
Subsidiaries [Member] | Employees [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 16,220 | 16,721 | 17,180
Subsidiaries [Member] | Workers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 5,259 | 5,659 | 5,703
Joint operations [member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 745 | 771 | 805
Joint operations [member] | Senior Managers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 17 | 17 | 18
Joint operations [member] | Junior Managers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 84 | 98 | 109
Joint operations [member] | Employees [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 361 | 371 | 384
Joint operations [member] | Workers [Member] |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |
Average number of employees | 283 | 285 | 294

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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