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Long-term debt - Amortised cost summary (Details) - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Long-term debt |  |  |
Unamortised loan costs | R (777) | R (792) |
Total long-term debt | 109,454 | 81,405 | R 79,877
Secured debt, preference shares and finance leases |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | 77,718 | 57,736 |
Secured Debt |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | 62,601 | 43,827 |
Preference shares |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | 7,493 | 12,045 |
Finance leases |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | 7,624 | 1,864 |
Unsecured debt |  |  |
Long-term debt |  |  |
Long-term debt, before unamortised costs | R 32,513 | R 24,461 |

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