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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R) R in Millions | Jun. 30, 2024 | Jun. 30, 2023
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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 5
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (4) | R (5)
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 (1,479) | R (1,251)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,744 | R 1,471
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 1,838 | R 1,561
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (1,589) | R (1,354)
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 265 | R 297
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (234) | R (227)
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 (1,143) | R (1,169)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,402 | R 1,445
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 877 | R 897
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (673) | R (690)

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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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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