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Taxation - Disclosure of Deferred Tax Liabilities and Assets on the Balance Sheet (Details) - ZAR (R) R in Millions | Jun. 30, 2019 | Jun. 30, 2018
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax liabilities | R 688 | R 1,145
Net deferred tax liability | 688 | 1,145
Gross deferred tax liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax liabilities | 1,237 | 1,533
Amortisation and depreciation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax liabilities | 1,229 | 1,440
Derivative assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax liabilities | 0 | 90
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax liabilities | 8 | 3
Gross deferred tax assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | 549 | 388
Unredeemed capital expenditure |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | 4,044 | 4,266
Provisions, including non-current provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | 844 | 680
Derivative financial instruments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | 87 | 0
Tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | 1,209 | 758
Deferred tax asset not recognised |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | (5,635) | (5,316)
PNG operations | Deferred tax asset not recognised |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross deferred tax assets | R 5,293 | R 5,109

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_o&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_56&doctype=Standard -URIDate 2018-03-16 + Details
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