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Taxation - Reconciliation of effective tax rate (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of average effective tax rate and applicable tax rate      
South African normal tax rate 28.00% 28.00% 28.00%
Increase in rate of tax due to - disallowed preference share dividends 0.30% 0.90% 0.90%
Increase in rate of tax due to - disallowed expenditure 9.40% 4.20% 2.30%
Increase in rate of tax due to - disallowed share-based payment expenses 2.90% 5.30% 0.10%
Increase in rate of tax due to - different tax rates 13.20% 2.60% 0.30%
Increase in rate of tax due to - effect of tax litigation matters     3.20%
Increase in rate of tax due to - tax losses not recognised 8.60% 9.30% 1.00%
Increase in rate of tax due to - prior year adjustments 2.00% 0.40%  
Increase in rate of tax due to - other adjustments 2.00% 1.50% 0.40%
Normal tax rate plus increase in tax rate 66.40% 52.20% 36.20%
Decrease in rate of tax due to - exempt income (1.70%) (4.20%) (0.40%)
Decrease in rate of tax due to - share of profits of equity accounted investments (3.30%) (2.60%) (1.00%)
Decrease in rate of tax due to - effect of tax litigation matters (8.20%)    
Decrease in rate of tax due to - recognition of previously unrecognised deferred tax assets     (1.60%)
Decrease in rate of tax due to - utilisation of tax losses (0.30%) (0.40%)  
Decrease in rate of tax due to - investment incentive allowances (17.20%) (6.90%) (2.40%)
Decrease in rate of tax due to - effect of tax rate change in the US   (1.40%)  
Decrease in rate of tax due to - translation differences (0.90%) (0.90%) (0.90%)
Decrease in rate of tax due to - prior year adjustments     (1.40%)
Decrease in rate of tax due to - other adjustments (0.60%) (0.40%) (0.20%)
Effective tax rate 34.20% 35.40% 28.30%
Adjusted effective tax rate 29.60% 27.30% 26.50%
Increase in energy efficiency allowance R 4,200    
Canadian shale gas asset      
Reconciliation of average effective tax rate and applicable tax rate      
Impairment loss 1,900 R 2,800  
Deferred tax asset raised on impairment loss R 0 0  
Mozambique PSA      
Reconciliation of average effective tax rate and applicable tax rate      
Impairment loss   1,100  
Deferred tax asset raised on impairment loss   R 0