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Costs - Average number of employees (Details) - employee | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsidiaries |  |  |
Costs |  |  |
Average number of employees | 31,048 | 31,136 | 31,573
Subsidiaries | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 993 | 1,014 | 999
Subsidiaries | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 9,280 | 9,267 | 9,095
Subsidiaries | Employees |  |  |
Costs |  |  |
Average number of employees | 15,995 | 15,945 | 16,220
Subsidiaries | Workers |  |  |
Costs |  |  |
Average number of employees | 4,780 | 4,910 | 5,259
Joint operations |  |  |
Costs |  |  |
Average number of employees | 726 | 741 | 745
Joint operations | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 17 | 16 | 17
Joint operations | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 73 | 77 | 84
Joint operations | Employees |  |  |
Costs |  |  |
Average number of employees | 349 | 361 | 361
Joint operations | Workers |  |  |
Costs |  |  |
Average number of employees | 287 | 287 | 283

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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