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Provision for Environmental Rehabilitation - Disclosure of Future Net Undiscounted Obligation (Details) - ZAR (R) R in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
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Disclosure of financial assets [line items] |  |  |
Ultimate estimated rehabilitation cost | R 4,139 | R 4,338 |
Amounts invested in environmental trust funds | (3,301) | (3,271) |
Total future net undiscounted obligation | 866 | 1,100 |
Investments held by environmental trust funds |  |  |
Disclosure of financial assets [line items] |  |  |
Amounts invested in environmental trust funds | R (3,273) | R (3,238) | R (2,621)

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