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Financial instruments (Details) - ZAR (R)
R in Millions
6 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Air Liquide    
Financial instruments    
Loss on fair value adjustment R 50  
IFRS 16 Impact | Air Liquide    
Financial instruments    
Derivative financial assets and liabilities - carrying value   R (624)
Derivatives | Level 2    
Financial instruments    
Derivative financial assets and liabilities - carrying value (537)  
Derivative financial assets and liabilities - fair value (537)  
Derivatives | Level 3    
Financial instruments    
Derivative financial assets and liabilities - carrying value (674)  
Derivative financial assets and liabilities - fair value (674)  
Listed long-term debt | Level 1    
Financial instruments    
Financial liabilities - carrying value 45,829  
Financial liabilities - fair value R 49,001