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Financial risk management and financial instruments - Interest Rate Risk (Details) R in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 25, 2019 item | Jun. 30, 2021 ZAR (R) item | Jun. 30, 2021 USD ($) item | Jun. 30, 2020 ZAR (R) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 ZAR (R)
Financial risk management and financial instruments |  |  |  |  |  |
Variable rate as a percentage of total financial assets |  | 94.00% |  | 99.00% |  |
Fixed rate as a percentage of total financial assets |  | 6.00% |  | 1.00% |  |
Variable rate as a percentage of total financial liabilities |  | 7.00% |  | 47.00% |  |
Fixed rate as a percentage of total financial liabilities |  | 93.00% |  | 53.00% |  |
Fair value (gain)/loss recognised in other comprehensive income |  | R (1,072) |  | R 2,192 |  | R 287
Variable |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial assets |  | 30,062 |  | 36,140 |  |
Financial liabilities |  | (7,898) |  | (97,531) |  |
Net financial instruments |  | 22,164 |  | (61,391) |  |
Fixed |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial assets |  | 1,788 |  | 525 |  |
Financial liabilities |  | (110,803) |  | (109,919) |  |
Net financial instruments |  | (109,015) |  | (109,394) |  |
Interest rate swap |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Financial liabilities |  | (2,103) |  | (4,143) |  |
Interest rate swap | Cash flow hedge | North America |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Hedging instrument, liabilities |  | 2,103 |  | 4,058 |  |
Fair value (gain)/loss recognised in other comprehensive income |  | (1,072) |  | 2,192 |  |
Fair value loss recognised in other operating expenses |  | 89 |  | 4 |  |
Balance of hedge reserve - continuing hedge relationships |  | (801) |  | (1,771) |  |
Balance of hedge reserve - discontinued hedge relationships |  | R (106) |  | R 0 |  |
Nominal amount |  | 1,751 |  | 1,854 |  |
Average fixed rate |  | 2.82% |  | 2.82% |  |
Hedge ratio |  | 100.00% |  | 100.00% |  |
Change in hedging instrument fair value used as the basis for recognising hedge ineffectiveness | $ |  |  | $ (32) |  | $ 148 |
Change in hedged item fair value used as the basis for recognising hedge ineffectiveness | $ |  |  | $ (38) |  | $ 151 |
Number of instruments traded | item | 7 |  |  |  |  |
Number of instruments novated | item |  | 1 | 1 |  |  |
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 166 |  | R 110 |  |
Interest rate risk | Variable | Europe |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R 19 |  | 15 |  |
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 25 |  | (761) |  |
Minimum reasonably possible repo interest rate |  | 0.00% |  |  |  |
Interest rate risk | Variable | Other |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Income statement impact of increase in risk variable |  | R 12 |  | R 21 |  |

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