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Statement of compliance (Details) - IFRS 16
R in Billions
Jun. 30, 2018
ZAR (R)
Minimum  
Statement of compliance [Line items]  
Additional lease liabilities R 9
Impact of additional lease liabilities on gearing (as a percent) 4.50%
Maximum  
Statement of compliance [Line items]  
Additional lease liabilities R 12
Impact of additional lease liabilities on gearing (as a percent) 6.50%
South Africa | Minimum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 9.95%
South Africa | Maximum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 11.95%
China | Minimum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 5.00%
China | Maximum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 7.80%
United States of America | Minimum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 3.00%
United States of America | Maximum  
Statement of compliance [Line items]  
Incremental borrowing rates (as a percent) 7.00%