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Financial risk management and financial instruments - Fair Value (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
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 13,345 R 13,365
Listed long-term debt | Level 1    
Financial risk management and financial instruments    
Financial liabilities - fair value 13,345  
Unlisted long-term debt    
Financial risk management and financial instruments    
Financial liabilities - fair value 95,984 68,896
Unlisted long-term debt | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 95,984  
Short-term debt and bank overdraft    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,035 2,986
Short-term debt and bank overdraft | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,035  
Derivative liabilities and guarantees (Long- and short-term financial liabilities)    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,059 1,473
Derivative liabilities and guarantees (Long- and short-term financial liabilities) | Level 2    
Financial risk management and financial instruments    
Financial liabilities - fair value 2,059  
Trade and other payables    
Financial risk management and financial instruments    
Financial liabilities - fair value 26,518 26,131
Trade and other payables | Level 3    
Financial risk management and financial instruments    
Financial liabilities - fair value 26,518  
Investments in listed securities    
Financial risk management and financial instruments    
Financial assets - fair value 682 681
Investments in listed securities | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value 682  
Investments in unlisted securities    
Financial risk management and financial instruments    
Financial assets - fair value 244 225
Investments in unlisted securities | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 244  
Other long-term investments    
Financial risk management and financial instruments    
Financial assets - fair value 25 81
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 3,786 3,737
Long-term receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 3,883  
Derivative assets (Long and short-term financial assets)    
Financial risk management and financial instruments    
Financial assets - fair value 1,827 2,739
Derivative assets (Long and short-term financial assets) | Level 2    
Financial risk management and financial instruments    
Financial assets - fair value 1,827  
Trade and other receivables    
Financial risk management and financial instruments    
Financial assets - fair value 26,648 24,675
Trade and other receivables | Level 3    
Financial risk management and financial instruments    
Financial assets - fair value 26,648  
Cash and cash equivalents    
Financial risk management and financial instruments    
Financial assets - fair value 17,128 R 29,446
Cash and cash equivalents | Level 1    
Financial risk management and financial instruments    
Financial assets - fair value R 17,128