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Deferred tax - Unremitted earning (Details) - ZAR (R) R in Millions	Jun. 30, 2021	Jun. 30, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits
Unremitted earnings at end of year that would be subject to dividend withholding tax	R 26,662	R 27,750
Tax effect if remitted	455	380
Europe
Disclosure of temporary difference, unused tax losses and unused tax credits
Unremitted earnings at end of year that would be subject to dividend withholding tax	20,051	19,943
Tax effect if remitted	277	133
Rest of Africa
Disclosure of temporary difference, unused tax losses and unused tax credits
Unremitted earnings at end of year that would be subject to dividend withholding tax	1,933	2,807
Tax effect if remitted	155	225
Other countries
Disclosure of temporary difference, unused tax losses and unused tax credits
Unremitted earnings at end of year that would be subject to dividend withholding tax	4,678	5,000
Tax effect if remitted	R 23	R 22