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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017
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South Africa | Salary increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R 14 | R 15
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (13) | R (14)
South Africa | Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R (1,447) | R (1,552)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,981 | R 2,494
South Africa | Pension increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R 2,035 | R 2,538
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (1,523) | R (1,622)
Foreign Countries | Salary increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R 454 | R 416
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (368) | R (353)
Foreign Countries | Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R (1,634) | R (1,507)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 2,174 | R 1,989
Foreign Countries | Pension increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption | R 1,071 | R 956
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (851) | R (731)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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