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Long-term provisions - Environmental provisions, Risk-free rates and Impact of changes to discount rates (Details)
Right in Millions, R in Millions
Jun. 30, 2021
ZAR (R)
Right
Jun. 30, 2020
ZAR (R)
Provisions    
Provisions R 17,361 R 22,905
Share Appreciation Right (SARs)    
Provisions    
Number of share appreciation rights vested but not exercised | Right 2.2  
Intrinsic value of share appreciation rights vested but not yet exercised R 0 0
Environmental    
Provisions    
Provisions 16,196 21,790
Investments restricted for mining rehabilitation purposes 676 661
Indemnities for mining rehabilitation purposes R 2,190 R 2,190
Assumed percentage change in discount rate 1.00% 1.00%
Increase in the discount rate R (4,352) R (3,836)
amount capitalised to property, plant and equipment (1,250) (2,767)
income recognised in income statement (3,102) (1,069)
Decrease in the discount rate 5,266 4,297
amount capitalised to property, plant and equipment 1,787 3,115
expense recognised in income statement R 3,479 R 1,182
Environmental | South Africa | Minimum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 4.20% 3.60%
Environmental | South Africa | Maximum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 10.30% 9.40%
Environmental | Europe | Minimum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 0.00%  
Environmental | Europe | Maximum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 0.50%  
Environmental | United States | Minimum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 0.20% 0.20%
Environmental | United States | Maximum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 1.80% 0.90%
Environmental | Canada | Minimum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 0.50% 0.50%
Environmental | Canada | Maximum    
Provisions    
Risk-free interest rate used to discount estimated cash flows related to provisions 2.30% 1.40%