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Deferred tax - Calculated tax losses carried forward (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Calculated tax losses carried forward that have not been recognised R 17,621 R 18,150
Between three and five years    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Calculated tax losses carried forward that have not been recognised 376  
More than five years    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Calculated tax losses carried forward that have not been recognised 16,826 17,920
Indefinite Life    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Calculated tax losses carried forward that have not been recognised R 419 R 230