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Financial risk management and financial instruments - Interest Rate Risk (Details) R in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 15, 2022 item | Jun. 30, 2022 ZAR (R) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 ZAR (R) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 ZAR (R)
Financial risk management and financial instruments |  |  |  |  |  |
Variable rate as a percentage of total financial assets |  | 85.00% |  | 94.00% |  |
Fixed rate as a percentage of total financial assets |  | 15.00% |  | 6.00% |  |
Variable rate as a percentage of total financial liabilities |  | 25.00% |  | 7.00% |  |
Fixed rate as a percentage of total financial liabilities |  | 75.00% |  | 93.00% |  |
Fair value gain/(loss) recognised in other comprehensive income |  | R 1,110 |  | R 1,072 |  | R (2,192)
Variable |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial assets |  | 40,250 |  | 30,062 |  |
Financial liabilities |  | (26,094) |  | (7,898) |  |
Net financial instruments |  | 14,156 |  | 22,164 |  |
Fixed |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial assets |  | 7,121 |  | 1,788 |  |
Financial liabilities |  | (78,913) |  | (110,803) |  |
Net financial instruments |  | (71,792) |  | (109,015) |  |
Interest rate swap |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial liabilities |  |  |  | (2,103) |  |
Interest rate swap | Variable |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Value of terminated contract | $ |  |  | $ 1,700 |  |  |
Interest rate swap | Cash flow hedge | North America |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Hedging instrument, liabilities |  |  |  | 2,103 |  |
Fair value gain/(loss) recognised in other comprehensive income |  | 1,818 |  | (1,072) |  |
Amount recognised in other operating expenses |  | 1,029 |  | 89 |  |
Amount recognised in other operating expenses on reclassification from cash flow hedge reserve |  | R 1,100 |  |  |  |
Balance of hedge reserve - continuing hedge relationships |  |  |  | (801) |  |
Balance of hedge reserve - discontinued hedge relationships |  |  |  | R (106) |  |
Nominal amount |  |  |  | 1,751 |  |
Average fixed rate |  | 2.82% |  | 2.82% |  |
Hedge ratio |  | 100.00% |  | 100.00% |  |
Fair value gain of continuing hedging instruments used as the basis for recognising hedge ineffectiveness | $ |  |  | 120 |  | $ 32 |
Fair value gain of hedged item used as the basis for recognising hedge ineffectiveness | $ |  |  | $ 121 |  | $ 38 |
Interest rate swap | Cash flow hedge | SOFR |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Number of instruments transitioned | item | 2 |  |  |  |  |
Interest rate risk | Variable |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Percentage of increase in risk variable used for sensitivity analysis |  | 1.00% |  | 1.00% |  |
Percentage of decrease in risk variable used for sensitivity analysis |  | 1.00% |  | 1.00% |  |
Interest rate risk | Variable | South Africa |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R 257 |  | R 166 |  |
Interest rate risk | Variable | Europe |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R 22 |  | 19 |  |
Minimum reasonably possible repo interest rate |  | 0.00% |  |  |  |
Interest rate risk | Variable | United States |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R (153) |  | 25 |  |
Interest rate risk | Variable | Other |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R 16 |  | R 12 |  |

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