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Financial risk management and financial instruments - Fair Value (Details)
R in Millions
12 Months Ended
Jun. 30, 2021
ZAR (R)
item
Jun. 30, 2020
ZAR (R)
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 72,226 R 50,701
Listed long-term debt | Level 1    
Financial risk management and financial instruments    
Financial liabilities - fair value 72,226 50,701
Unlisted long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 34,274 109,724
Unlisted long-term debt | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 34,274 109,724
Short-term debt and bank overdraft    
Financial risk management and financial instruments    
Financial liabilities - fair value 303 22,533
Short-term debt and bank overdraft | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 303 22,533
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - fair value 22,637 21,164
Trade and other payables | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 22,637 21,164
Commodity and currency derivative liabilities | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,456 3,435
Interest rate swap | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value R 2,103 4,143
Embedded derivative    
Financial risk management and financial instruments    
Number of embedded derivatives separately recognised | item 2  
Embedded derivative | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value R 514 2,168
Embedded derivative, US dollar portion    
Financial risk management and financial instruments    
Financial liabilities - fair value 514 2,183
Investments in listed securities    
Financial risk management and financial instruments    
Financial assets - fair value 466 498
Investments in listed securities | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 466 498
Investments in unlisted securities    
Financial risk management and financial instruments    
Financial assets - fair value 8 13
Investments in unlisted securities | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 8 13
Other long-term investments    
Financial risk management and financial instruments    
Financial assets - fair value 1,422 1,415
Other long-term investments | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 1,422 1,390
Other long-term investments | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value   25
Long-term receivables    
Financial risk management and financial instruments    
Financial assets - fair value 3,879 5,799
Long-term receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 3,879 5,799
Commodity and currency derivative assets | Level 2    
Financial risk management and financial instruments    
Financial assets - fair value 1,436 645
Embedded derivative | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 887  
Embedded derivative, US dollar portion    
Financial risk management and financial instruments    
Financial assets - fair value 256  
Embedded derivative, EUR portion    
Financial risk management and financial instruments    
Financial assets - fair value 631  
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - fair value 27,218 22,066
Trade and other receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 27,218 22,066
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - fair value 31,231 34,739
Cash and cash equivalents | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value R 31,231 R 34,739