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Costs (Details 3) - Number | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsidiaries [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 32,464 | 33,061 | 33,715
Subsidiaries [Member] | Senior Managers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 995 | 1,018 | 1,044
Subsidiaries [Member] | Junior Managers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 9,089 | 9,160 | 9,091
Subsidiaries [Member] | Employees [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 16,721 | 17,180 | 17,685
Subsidiaries [Member] | Workers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 5,659 | 5,703 | 5,895
Joint Ventures Where EntityIs Venturer [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 771 | 805 | 807
Joint Ventures Where EntityIs Venturer [Member] | Senior Managers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 17 | 18 | 17
Joint Ventures Where EntityIs Venturer [Member] | Junior Managers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 98 | 109 | 108
Joint Ventures Where EntityIs Venturer [Member] | Employees [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 371 | 384 | 379
Joint Ventures Where EntityIs Venturer [Member] | Workers [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Average number of employees | 285 | 294 | 303

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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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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