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Costs - Average number of employees (Details) - Number
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subsidiaries      
Costs      
Average number of employees 31,632 31,332 31,048
Subsidiaries | Senior Managers      
Costs      
Average number of employees 957 966 993
Subsidiaries | Junior Managers      
Costs      
Average number of employees 9,084 9,143 9,280
Subsidiaries | Employees      
Costs      
Average number of employees 15,517 15,747 15,995
Subsidiaries | Workers      
Costs      
Average number of employees 6,074 5,476 4,780
Joint operations      
Costs      
Average number of employees 807 760 726
Joint operations | Senior Managers      
Costs      
Average number of employees 19 18 17
Joint operations | Junior Managers      
Costs      
Average number of employees 80 78 73
Joint operations | Employees      
Costs      
Average number of employees 420 380 349
Joint operations | Workers      
Costs      
Average number of employees 288 284 287