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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