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Post-retirement benefit obligations - Sensitivity Analysis (Details) - ZAR (R) R in Millions | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Sensitivity analysis |  |
Cost inflation as premium over CPI | 2.00% |
South Africa | Healthcare | Healthcare cost inflation |  |
Sensitivity analysis |  |
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 361 | R 387
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (310) | R (325)
South Africa | Healthcare | Discount rate |  |
Sensitivity analysis |  |
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 (293) | R (309)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 346 | R 373
United States of America | Healthcare | Healthcare cost inflation |  |
Sensitivity analysis |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%
United States of America | Healthcare | Discount rate |  |
Sensitivity analysis |  |
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 (22) | R (21)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 27 | R 28

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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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- Definition The reasonably possible percentage of the increase 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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