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Deferred tax - Attributable to tax jurisdictions (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities R 21,812 R 22,778 R 20,302
South Africa      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities 22,501 23,699  
United States of America      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities 301 (370)  
GERMANY      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities (431) (210)  
MOZAMBIQUE      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities 766 1,036  
Other Country      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax liabilities R (1,325) R (1,377)