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Deferred tax - Calculated tax losses carried forward (Details) - ZAR (R)
R in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 4,230 R 2,538
Within one year    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised 167 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 1,085 1,150
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 763 608
Indefinite Life    
Disclosure of temporary difference, unused tax losses and unused tax credits    
Calculated tax losses carried forward that have not been recognised R 2,215 R 777