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Deferred tax - Calculated tax losses carried forward (Details) - ZAR (R)
R in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 2,538 R 21,007
Within one year    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised 3  
One to five years    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised 1,150 1,201
More than five years    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised 608 19,090
Indefinite Life    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 777 R 716