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Financial risk management and financial instruments - Currency Exposure (Details) - Foreign currency risk - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Financial risk management and financial instruments    
Percentage of change in significant exposure used for sensitivity analysis 10.00% 10.00%
Euro    
Financial risk management and financial instruments    
Net exposure R 3,254 R (129)
Equity impact of decrease in risk exposure 325 (13)
Income statement impact of decrease in risk exposure 325 (13)
Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 2,897 2,726
Net exposure on liabilities (166) (296)
Net exposure 2,731 2,430
Euro | Balances between group companies    
Financial risk management and financial instruments    
Net exposure 523 (2,559)
US Dollar    
Financial risk management and financial instruments    
Net exposure 12,390 (5,878)
Equity impact of decrease in risk exposure 1,239 (511)
Income statement impact of decrease in risk exposure 1,239 (511)
US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 8,656 3,709
Net exposure on liabilities (4,552) (1,523)
Net exposure 4,104 2,186
US Dollar | Balances between group companies    
Financial risk management and financial instruments    
Net exposure 8,286 (8,064)
Trade and other payables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (166) (296)
Trade and other payables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (4,552) (1,523)
Long-term receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 336 323
Trade and other receivables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 739 831
Trade and other receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 4,961 2,265
Cash and cash equivalents | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 2,158 1,895
Cash and cash equivalents | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets R 3,359 R 1,121