XML 157 R81.htm IDEA: XBRL DOCUMENT v3.19.3
Accounting Policies - Change in accounting policy - classification of by-products (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of voluntary change in accounting policy [line items]      
Revenue R 26,912 R 20,452 R 19,494
Cost of sales R 28,869 23,596 19,869
Previously presented      
Disclosure of voluntary change in accounting policy [line items]      
Revenue   20,359 19,264
Cost of sales   23,503 19,639
Increase due to voluntary changes in accounting policy      
Disclosure of voluntary change in accounting policy [line items]      
Revenue   93 230
Cost of sales   R 93 R 230