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Costs - Average number of employees (Details) - NUMBER | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Subsidiaries |  |  |
Costs |  |  |
Average number of employees | 31,848 | 31,632 | 31,332
Subsidiaries | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 944 | 957 | 966
Subsidiaries | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 9,157 | 9,084 | 9,143
Subsidiaries | Employees |  |  |
Costs |  |  |
Average number of employees | 15,810 | 15,517 | 15,747
Subsidiaries | Workers |  |  |
Costs |  |  |
Average number of employees | 5,937 | 6,074 | 5,476
Joint operations |  |  |
Costs |  |  |
Average number of employees | 817 | 807 | 760
Joint operations | Senior Managers |  |  |
Costs |  |  |
Average number of employees | 19 | 19 | 18
Joint operations | Junior Managers |  |  |
Costs |  |  |
Average number of employees | 84 | 80 | 78
Joint operations | Employees |  |  |
Costs |  |  |
Average number of employees | 420 | 420 | 380
Joint operations | Workers |  |  |
Costs |  |  |
Average number of employees | 294 | 288 | 284

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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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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