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Costs - Average number of employees (Details) - employee | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsidiaries |  |  |
Costs |  |  |
Average number of employees | 31,136 | 31,573 | 32,464
Subsidiaries | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 1,014 | 999 | 995
Subsidiaries | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 9,267 | 9,095 | 9,089
Subsidiaries | Employees |  |  |
Costs |  |  |
Average number of employees | 15,945 | 16,220 | 16,721
Subsidiaries | Workers |  |  |
Costs |  |  |
Average number of employees | 4,910 | 5,259 | 5,659
Joint operations |  |  |
Costs |  |  |
Average number of employees | 741 | 745 | 771
Joint operations | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 16 | 17 | 17
Joint operations | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 77 | 84 | 98
Joint operations | Employees |  |  |
Costs |  |  |
Average number of employees | 361 | 361 | 371
Joint operations | Workers |  |  |
Costs |  |  |
Average number of employees | 287 | 283 | 285

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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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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