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Financial risk management and financial instruments - Fair Value (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
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    
Gains (losses) on change in fair value of derivatives (6,997) R (2,465) R (3,876)
Listed long-term debt      
Financial risk management and financial instruments      
Financial liabilities - fair value 50,701 49,421  
Listed long-term debt | Level 1      
Financial risk management and financial instruments      
Financial liabilities - fair value 50,701 49,421  
Unlisted long-term debt      
Financial risk management and financial instruments      
Financial liabilities - fair value 109,724 84,007  
Unlisted long-term debt | Level 3      
Financial risk management and financial instruments      
Financial liabilities - fair value 109,724 91,777  
Short-term debt and bank overdraft      
Financial risk management and financial instruments      
Financial liabilities - fair value 22,533 1,297  
Short-term debt and bank overdraft | Level 3      
Financial risk management and financial instruments      
Financial liabilities - fair value 22,533 1,297  
Derivative liabilities (Long- and short-term financial liabilities)      
Financial risk management and financial instruments      
Financial liabilities - fair value 9,891 2,205  
Derivative liabilities (Long- and short-term financial liabilities) | Level 2      
Financial risk management and financial instruments      
Financial liabilities - fair value 7,723 2,205  
Derivative liabilities (Long- and short-term financial liabilities) | Level 3      
Financial risk management and financial instruments      
Financial liabilities - fair value 2,168    
Trade and other payables      
Financial risk management and financial instruments      
Financial liabilities - fair value 21,164 28,501  
Trade and other payables | Level 3      
Financial risk management and financial instruments      
Financial liabilities - fair value 21,164 28,501  
Embedded derivative | Level 3      
Financial risk management and financial instruments      
Gains (losses) on change in fair value of derivatives 1,600    
Embedded derivative | Level 3 | IFRS 16 Impact      
Financial risk management and financial instruments      
Derivative financial assets and liabilities - carrying value   624  
Investments in listed securities      
Financial risk management and financial instruments      
Financial assets - fair value 498 830  
Investments in listed securities | Level 1      
Financial risk management and financial instruments      
Financial assets - fair value 498 830  
Investments in unlisted securities      
Financial risk management and financial instruments      
Financial assets - fair value 13 393  
Investments in unlisted securities | Level 3      
Financial risk management and financial instruments      
Financial assets - fair value 13 393  
Other long-term investments      
Financial risk management and financial instruments      
Financial assets - fair value 1,415 25  
Other long-term investments | Level 1      
Financial risk management and financial instruments      
Financial assets - fair value 1,390    
Other long-term investments | Level 3      
Financial risk management and financial instruments      
Financial assets - fair value 25 25  
Long-term receivables      
Financial risk management and financial instruments      
Financial assets - fair value 5,799 5,582  
Long-term receivables | Level 3      
Financial risk management and financial instruments      
Financial assets - fair value 5,799 5,582  
Derivative assets (Long and short-term financial assets)      
Financial risk management and financial instruments      
Financial assets - fair value 645 645  
Derivative assets (Long and short-term financial assets) | Level 2      
Financial risk management and financial instruments      
Financial assets - fair value 645 645  
Trade and other receivables      
Financial risk management and financial instruments      
Financial assets - fair value 22,066 25,611  
Trade and other receivables | Level 3      
Financial risk management and financial instruments      
Financial assets - fair value 22,066 25,611  
Cash and cash equivalents      
Financial risk management and financial instruments      
Financial assets - fair value 34,739 15,877  
Cash and cash equivalents | Level 1      
Financial risk management and financial instruments      
Financial assets - fair value R 34,739 R 15,877