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Long-term provisions - Expected timing of future cash flows and Business segmentation (Details) - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Total provisions | R 17,727 | R 18,779 | R 21,873
Short-term portion | (2,567) | (2,131) |
Long-term provisions | 15,160 | 16,648 |
Estimated undiscounted obligation | 102,952 | 102,729 |
Mining |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 1,324 | 1,573 |
Exploration And Production International |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 5,677 | 5,857 |
Energy |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 2,909 | 3,091 |
Base Chemicals |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 3,057 | 3,104 |
Performance Chemicals |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 2,173 | 2,224 |
Group Functions |  |  |
Disclosure of other provisions [line items] |  |  |
Long-term provisions | 20 | 799 |
Within one year |  |  |
Disclosure of other provisions [line items] |  |  |
Total provisions | 2,567 | 2,131 |
One to five years |  |  |
Disclosure of other provisions [line items] |  |  |
Total provisions | 3,715 | 4,196 |
More than five years |  |  |
Disclosure of other provisions [line items] |  |  |
Total provisions | R 11,445 | R 12,452 |

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