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Financial risk management and financial instruments - Fair Value (Details) - ZAR (R)
R in Millions
12 Months Ended
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  
Listed long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 49,421 R 13,345
Listed long-term debt | Level 1    
Financial risk management and financial instruments    
Financial liabilities - fair value 49,421  
Unlisted long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 91,777 95,984
Unlisted long-term debt | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 91,777  
Short-term debt and bank overdraft    
Financial risk management and financial instruments    
Financial liabilities - fair value 1,297 2,035
Short-term debt and bank overdraft | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 1,297  
Derivative liabilities and guarantees (Long- and short-term financial liabilities)    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,205 2,059
Derivative liabilities and guarantees (Long- and short-term financial liabilities) | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,205  
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - fair value 28,501 26,518
Trade and other payables | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 28,501  
Investments in listed securities    
Financial risk management and financial instruments    
Financial assets - fair value 830 682
Investments in listed securities | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 830  
Investments in unlisted securities    
Financial risk management and financial instruments    
Financial assets - fair value 393 244
Investments in unlisted securities | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 393  
Other long-term investments    
Financial risk management and financial instruments    
Financial assets - fair value 25 25
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 5,582 3,824
Long-term receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 5,582  
Derivative assets (Long and short-term financial assets)    
Financial risk management and financial instruments    
Financial assets - fair value 645 1,827
Derivative assets (Long and short-term financial assets) | Level 2    
Financial risk management and financial instruments    
Financial assets - fair value 645  
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - fair value 25,611 26,648
Trade and other receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 25,611  
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - fair value 15,877 R 17,128
Cash and cash equivalents | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value R 15,877