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Post-retirement benefit obligations (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Net assets R (1,498) R (622)
Current net liabilities (389) (354)
Noncurrent net liabilities 11,900 11,069
Healthcare    
Disclosure of net defined benefit liability (asset) [line items]    
Net liabilities 4,243 4,163
Current net liabilities (197) (178)
Noncurrent net liabilities 4,046 3,985
Pension    
Disclosure of net defined benefit liability (asset) [line items]    
Net liabilities 8,046 7,260
Net assets (1,498) (622)
Net liability (asset) recognized 6,548 6,638
Current net liabilities (192) (176)
Noncurrent net liabilities 7,854 7,084
South Africa | Healthcare    
Disclosure of net defined benefit liability (asset) [line items]    
Net liabilities 3,995 3,921
Current net liabilities (177) (159)
Noncurrent net liabilities 3,818 3,762
South Africa | Pension    
Disclosure of net defined benefit liability (asset) [line items]    
Net assets (582) (622)
Net liability (asset) recognized (582) (622)
United States of America | Healthcare    
Disclosure of net defined benefit liability (asset) [line items]    
Net liabilities 248 242
Current net liabilities (20) (19)
Noncurrent net liabilities 228 223
Foreign Countries | Pension    
Disclosure of net defined benefit liability (asset) [line items]    
Net liabilities 8,046 7,260
Net assets (916)  
Net liability (asset) recognized 7,130 7,260
Current net liabilities (192) (176)
Noncurrent net liabilities R 7,854 R 7,084