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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R) R in Millions | Jun. 30, 2022 | Jun. 30, 2021
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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 6 | R 9
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (6) | R (8)
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 (1,161) | R (1,474)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,364 | R 1,748
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 1,453 | R 1,821
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (1,261) | R (1,566)
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 312 | R 470
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (271) | R (446)
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 (1,199) | R (1,833)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 1,507 | R 2,360
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 929 | R 1,353
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (737) | R (1,102)

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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 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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