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Long-term debt - Amortised cost summary (Details) - ZAR (R)
R in Millions
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Long-term debt      
Unamortised loan costs R (703) R (375)  
Total long-term debt 124,068 104,834 R 102,643
Secured Debt      
Long-term debt      
Long-term debt, before unamortised costs 29 67  
Unsecured debt      
Long-term debt      
Long-term debt, before unamortised costs R 124,742 R 105,142