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Financial risk management and financial instruments - Commodity Price Risk (Details) R in Millions, $ in Millions | 12 Months Ended |  |
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Jun. 30, 2019 USD ($) | Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 USD ($) $ / bbl R / $ | Jun. 30, 2018 ZAR (R) $ / bbl | Jun. 30, 2017 USD ($) $ / bbl | Jun. 30, 2018 ZAR (R) $ / bbl R / $ | Jun. 30, 2017 ZAR (R)
Financial risk management and financial instruments |  |  |  |  |  |  |
Increase in average annual crude oil price for forecasting purposes |  |  | 1 |  |  | 1 |
Impact on operating profit of increase in crude oil price | $ 66 | R 860 | $ 62 | R 850 |  |  |
Average exchange rate assumption | R / $ |  |  | 13.00 |  |  | 13.00 |
Period of average prices used in risk calculation |  |  | 12 months | 12 months |  |  |
Period of constant average exchange rate used in risk calculation |  |  | 12 months | 12 months |  |  |
Crude oil futures |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |
Contract/Notional amount |  |  | $ 194 |  | $ 123 | R 2,792 | R 1,602
Fair value | R |  |  |  |  |  | (91) | 52
Maximum |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |
Dated Brent Crude price |  |  | 80.29 | 80.29 | 56.30 |  |
Average |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |
Dated Brent Crude price |  |  | 63.62 | 63.62 | 49.77 |  |
Minimum |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |
Dated Brent Crude price |  |  | 46.53 | 46.53 | 40.26 |  |
Within one year | Crude oil futures |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |
Fair value | R |  |  |  |  |  | R (91) | R 52

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