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Taxation - Disclosure of Potential Future Tax Deductions (Details) - ZAR (R)
R in Millions
Jun. 30, 2019
Jun. 30, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Amount of deferred tax not recognised, deductible temporary differences R 12,935 R 12,215
Unredeemed capital expenditure available for utilisation against future mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 39,725 38,711
Deductible temporary differences for which no deferred tax asset is recognised 35,038 34,021
Tax losses carried forward utilisable against mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 5,494 4,334
Deductible temporary differences for which no deferred tax asset is recognised 5,109 4,196
Capital Gains Tax (CGT) losses available to be utilised against future CGT gains    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 571 571
Deductible temporary differences for which no deferred tax asset is recognised 571 571
Hidden Valley | Unredeemed capital expenditure available for utilisation against future mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 16,333 17,030
Avgold | Unredeemed capital expenditure available for utilisation against future mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 19,086 16,991
Randfontein | Unredeemed capital expenditure available for utilisation against future mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions 2,134 2,163
Moab Khotsong | Unredeemed capital expenditure available for utilisation against future mining taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Potential future tax deductions R 1,755 R 2,091