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Long-term debt - Amortised cost summary (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Long-term debt      
Unamortised loan costs R (777) R (792)  
Total long-term debt 109,454 81,405 R 79,877
Secured debt, preference shares and finance leases      
Long-term debt      
Long-term debt, before unamortised costs 77,718 57,736  
Secured Debt      
Long-term debt      
Long-term debt, before unamortised costs 62,601 43,827  
Preference shares      
Long-term debt      
Long-term debt, before unamortised costs 7,493 12,045  
Finance leases      
Long-term debt      
Long-term debt, before unamortised costs 7,624 1,864  
Unsecured debt      
Long-term debt      
Long-term debt, before unamortised costs R 32,513 R 24,461