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Deferred tax - Calculated tax losses carried forward (Details) - ZAR (R)
R in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 5,065 R 4,230
Within one year    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised 207 167
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   1,085
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 1,307 763
Indefinite Life    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 3,551 R 2,215