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Long-term provisions - Environmental provisions, Risk-free rates and Impact of changes to discount rates (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of other provisions [line items]      
Provisions R 17,727 R 18,779 R 21,873
Environmental      
Disclosure of other provisions [line items]      
Provisions 14,933 15,716 R 17,128
Investments restricted for mining rehabilitation purposes 649 607  
Indemnities for mining rehabilitation purposes R 2,066 1,952  
Assumed percentage change in discount rate 1.00%    
Increase in the discount rate R (2,202) (2,983)  
amount capitalised to property, plant and equipment (910) (1,646)  
income recognised in income statement (1,292) (1,337)  
Decrease in the discount rate 3,786 4,114  
amount capitalised to property, plant and equipment 2,058 2,272  
expense recognised in income statement R 1,728 R 1,842  
Minimum | Environmental | South Africa      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 7.30% 7.30%  
Minimum | Environmental | Europe      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 0.00% 0.00%  
Minimum | Environmental | United States of America      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 2.60% 1.30%  
Minimum | Environmental | Canada      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 2.00% 0.90%  
Maximum | Environmental | South Africa      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 9.20% 8.60%  
Maximum | Environmental | Europe      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 1.50% 1.50%  
Maximum | Environmental | United States of America      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 3.00% 2.60%  
Maximum | Environmental | Canada      
Disclosure of other provisions [line items]      
Risk-free interest rate used to discount estimated cash flows related to provisions 2.70% 2.50%