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Restricted Investments - Disclosure of Environmental Trust Funds (Details) - ZAR (R) R in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Restricted investments | R 3,301 | R 3,271 |
Investments held by environmental trust funds |  |  |
Disclosure of financial assets [line items] |  |  |
Restricted investments | 3,273 | 3,238 | R 2,621
Fixed deposits |  |  |
Disclosure of financial assets [line items] |  |  |
Restricted investments | 2,015 | 2,335 |
Cash and cash equivalents |  |  |
Disclosure of financial assets [line items] |  |  |
Restricted investments | 30 | 23 |
Equity-linked deposits |  |  |
Disclosure of financial assets [line items] |  |  |
Restricted investments | R 1,228 | R 880 |

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