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Net finance costs - Finance costs (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest R 6,810 R 9,743 R 6,613
Amortisation of loan costs 160 135 725
Notional interest 668 945 857
Total finance costs 7,638 10,823 8,195
Amounts capitalised to assets under construction a class of Property, plant and equipment (880) (3,520) (6,942)
Finance costs per income statement 6,758 7,303 1,253
Total finance costs before amortisation of loan costs and notional interest 6,810 9,743 6,613
Add: modification (loss)/gain   (1,193) 109
Less: interest accrued on long-term debt, lease liabilities and short-term debt (637) (1,412) (1,025)
Less: interest reversed/(accrued) on tax payable   16 525
Finance costs per the statement of cash flows 6,173 7,154 6,222
Debt and interest rate swap      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 5,238 8,226 6,088
Total finance costs before amortisation of loan costs and notional interest 5,238 8,226 6,088
Secured and unsecured debt      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 4,855 8,090 6,044
Total finance costs before amortisation of loan costs and notional interest 4,855 8,090 6,044
Interest rate swap      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 383 136 44
Total finance costs before amortisation of loan costs and notional interest 383 136 44
Preference shares      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest     116
Total finance costs before amortisation of loan costs and notional interest     116
Lease liabilities      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 1,488 1,465 871
Total finance costs before amortisation of loan costs and notional interest 1,488 1,465 871
Other      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 84 52 (462)
Total finance costs before amortisation of loan costs and notional interest R 84 R 52 R (462)