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Employee-related expenditure - Number of employees (Details) - employee | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
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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

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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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