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Deferred tax - Temporary differences (Details) - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | R (4,096) | R (3,082)
Deferred tax liabilities | 25,908 | 25,860
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 1,194 | 1,200
Deferred tax liabilities | 32,233 | 31,009
Current assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | (777) | (289)
Short- and long-term provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | (1,296) | (1,560)
Deferred tax liabilities | (4,991) | (4,898)
Calculated tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | (3,267) | (1,705)
Deferred tax liabilities | (284) | (518)
Derivatives |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | 57 | 11
Other Temporary Differences |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | (727) | (1,017)
Deferred tax liabilities | R (330) | R 545

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