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Tax paid (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Line Items]      
Net amounts (receivable)/ unpaid at beginning of year R (635) R (1,609) R (658)
Disposal of businesses (35)    
Net interest and penalties on tax 92 245 (72)
Income tax per income statement 6,633 7,134 8,332
Foreign exchange differences recognised in income statement (52) (8) 66
Translation of foreign operations 54 (45) 52
Current tax beginning balance and expenses 6,057 5,717 7,720
Net amounts receivable at end of year 984 635 1,609
Tax payable (2,318) (1,903) (878)
Tax receivable 3,302 2,538 2,487
Per the statement of cash flows 7,041 6,352 9,329
Dividend withholding tax 68 59 86
Normal tax including dividend withholding tax 7,041 6,352 9,329
South Africa      
Income Tax Disclosure [Line Items]      
Normal tax 4,681 3,984 6,321
Foreign Countries      
Income Tax Disclosure [Line Items]      
Normal tax R 2,292 R 2,309 R 2,922