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Financial risk management and financial instruments - Fair Value (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Financial risk management and financial instruments    
Transfers from Level 1 to Level 2, assets R 0  
Transfers from Level 2 to Level 1, assets 0  
Transfers into Level 3, assets 0  
Transfers out of Level 3, assets 0  
Transfers from Level 1 to Level 2, liabilities 0  
Transfers from Level 2 to Level 1, liabilities 0  
Transfers into Level 3, liabilities 0  
Transfers out of Level 3, liabilities 0  
Listed long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 71,667 R 72,226
Listed long-term debt | Level 1    
Financial risk management and financial instruments    
Financial liabilities - fair value 71,667 72,226
Unlisted long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 26,824 34,274
Unlisted long-term debt | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 26,824 34,274
Short-term debt and bank overdraft    
Financial risk management and financial instruments    
Financial liabilities - fair value 255 303
Short-term debt and bank overdraft | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 255 303
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - fair value 39,873 23,289
Trade and other payables | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 39,873 23,289
Commodity and currency derivative liabilities | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value 6,845 2,456
Interest rate swap | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value   2,103
Embedded derivative | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 282 514
Investments in listed securities    
Financial risk management and financial instruments    
Financial assets - fair value 480 466
Investments in listed securities | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 480 466
Investments in unlisted securities    
Financial risk management and financial instruments    
Financial assets - fair value 13 8
Investments in unlisted securities | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 13 8
Long-term restricted cash    
Financial risk management and financial instruments    
Financial assets - fair value 1,531 1,422
Long-term restricted cash | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 1,531 1,422
Long-term receivables    
Financial risk management and financial instruments    
Financial assets - fair value 3,023 3,879
Long-term receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 3,023 3,879
Commodity and currency derivative assets | Level 2    
Financial risk management and financial instruments    
Financial assets - fair value 247 1,436
Embedded derivative | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 621 887
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - fair value 38,936 27,140
Trade and other receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 38,936 27,140
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - fair value 43,140 31,231
Cash and cash equivalents | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value R 43,140 R 31,231