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Financial risk management and financial instruments - Foreign Currency Risk (Details) € in Millions, R in Millions, $ in Millions | 12 Months Ended |  |
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Jun. 30, 2019 USD ($) | Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 ZAR (R) | Jun. 30, 2018 EUR (€) $ / bbl R / $ | Jun. 30, 2018 USD ($) $ / bbl R / $ | Jun. 30, 2018 ZAR (R) $ / bbl R / $ | Jun. 30, 2017 EUR (€) $ / bbl | Jun. 30, 2017 USD ($) $ / bbl | Jun. 30, 2017 ZAR (R) $ / bbl
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Increase in exchange rate for forecasting purposes | R / $ |  |  |  |  | 0.10 | 0.10 | 0.10 |  |  |
Impact on operating profit of increase in exchange rate | $ 68 | R 880 | $ 52 | R 710 |  |  |  |  |  |
Average oil price assumption | $ / bbl |  |  |  |  | 72 | 72 | 72 | 50 | 50 | 50
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 |  |  |  |  |  |
Zero cost collar |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Period of foreign currency exposure hedged |  |  | 12 months | 12 months |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 4,000 |  |  | $ 4,000 |
Zero cost collar | Minimum |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Percentage of foreign currency exposure over the next 12 months hedged by the group |  |  | 70.00% | 70.00% |  |  |  |  |  |
Zero cost collar | Maximum |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Percentage of foreign currency exposure over the next 12 months hedged by the group |  |  | 80.00% | 80.00% |  |  |  |  |  |
Maturity period of derivatives |  |  | 1 year | 1 year |  |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 226 |  |  | $ 300 |
Foreign exchange contracts | Cash flow hedge | Rand |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Notional amount | R |  |  |  |  |  |  | R 33 |  |  | R 34
Foreign exchange contracts | Cash flow hedge | Euro |  |  |  |  |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  | € 2.1 |  |  | € 2.3 |  |

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