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Employee-related expenditure - Number of employees (Details) - employee
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Number and average number of employees [abstract]      
Permanent employees 31,020 30,600 29,726
Non-permanent employees 250 300 374
Total number of employees 31,270 30,900 30,100
Mining      
Number and average number of employees [abstract]      
Total number of employees 7,471 7,483 7,263
Exploration And Production International      
Number and average number of employees [abstract]      
Total number of employees 430 416 413
Energy      
Number and average number of employees [abstract]      
Total number of employees 5,069 5,008 4,820
Base Chemicals      
Number and average number of employees [abstract]      
Total number of employees 6,723 6,430 6,145
Performance Chemicals      
Number and average number of employees [abstract]      
Total number of employees 6,601 6,443 6,342
Group Functions      
Number and average number of employees [abstract]      
Total number of employees 4,976 5,120 5,117