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Post-retirement benefit obligations - Sensitivity Analysis (Details) - Healthcare - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Sensitivity analysis |  |
Cost inflation as premium over CPI | 2.00% |
South Africa | 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 582 | R 594
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (475) | R (487)
South Africa | 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 (452) | R (472)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 562 | R 584
South Africa | Pension increase |  |
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 159 | R 145
Increase (decrease) in net obligation due to decrease in actuarial assumption | R (191) | R (183)
United States of America | 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 | 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 (21) | R (20)
Increase (decrease) in net obligation due to decrease in actuarial assumption | R 25 | R 24
United States of America | Pension increase |  |
Sensitivity analysis |  |
Increase in actuarial assumption (as a percent) | 1.00% | 1.00%
Decrease in actuarial assumption (as a percent) | 1.00% | 1.00%

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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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- 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 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 percentage of healthcare cost inflation is CPI inflation over the long term. + References No definition available. + Details
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