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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R) R in Millions | Jun. 30, 2023 | Jun. 30, 2022
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South Africa | Salary increase |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 5 | R 6
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (5) | R (6)
South Africa | Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 (1,251) | R (1,161)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,471 | R 1,364
South Africa | Pension increase |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 1,561 | R 1,453
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (1,354) | R (1,261)
Foreign Countries | Salary increase |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 297 | R 312
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (227) | R (271)
Foreign Countries | Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 (1,169) | R (1,199)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,445 | R 1,507
Foreign Countries | Pension increase |  |
Disclosure of sensitivity analysis for actuarial assumptions |  |
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 897 | R 929
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (690) | R (737)

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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 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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