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Long-term debt - Amortised cost summary (Details) - ZAR (R) R in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Long-term debt |  |  |
Unamortised loan costs | R (439) | R (627) |
Total long-term debt | R 102,643 | 167,197 | R 129,569
Gemini HDPE LLC |  |  |
Long-term debt |  |  |
Proportion of equity interest disposed of | 50.00% |  |
Secured Debt |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | R 108 | 4,608 |
Unsecured debt |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | R 102,974 | R 163,216 |

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