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Financial risk management and financial instruments - Commodity Price Risk (Details) R in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) $ / bbl | Jun. 30, 2018 USD ($) $ / bbl | Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 ZAR (R)
Crude oil futures |  |  |  |
Financial risk management and financial instruments |  |  |  |
Contract/Notional amount | $ 92 | $ 194 | R 1,521 | R 2,792
Fair value |  |  | (27) | (91)
Other commodity derivatives |  |  |  |
Financial risk management and financial instruments |  |  |  |
Contract/Notional amount |  |  | 254 |
Fair value |  |  | 21 |
Maximum |  |  |  |
Financial risk management and financial instruments |  |  |  |
Dated Brent Crude price | $ / bbl | 86.16 | 80.29 |  |
Average |  |  |  |
Financial risk management and financial instruments |  |  |  |
Dated Brent Crude price | $ / bbl | 68.63 | 63.62 |  |
Minimum |  |  |  |
Financial risk management and financial instruments |  |  |  |
Dated Brent Crude price | $ / bbl | 50.21 | 46.53 |  |
Within one year | Crude oil futures |  |  |  |
Financial risk management and financial instruments |  |  |  |
Fair value |  |  | (27) | R (91)
Within one year | Other commodity derivatives |  |  |  |
Financial risk management and financial instruments |  |  |  |
Fair value |  |  | R 21 |

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