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Deferred tax - Unremitted earning (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unremitted earnings at end of year that would be subject to dividend withholding tax R 45,280 R 40,266
Tax effect if remitted 1,718 1,582
Europe    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unremitted earnings at end of year that would be subject to dividend withholding tax 12,555 11,826
Tax effect if remitted 267 327
Rest of Africa    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unremitted earnings at end of year that would be subject to dividend withholding tax 2,346 2,891
Tax effect if remitted 188 235
United States of America    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unremitted earnings at end of year that would be subject to dividend withholding tax 23,591 18,968
Tax effect if remitted 1,179 948
Other Country    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unremitted earnings at end of year that would be subject to dividend withholding tax 6,788 6,581
Tax effect if remitted R 84 R 72