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Other Non-Current Assets - Schedule of Other Non-Current Assets (Details) - ZAR (R)
R in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of financial assets [line items]          
Debt instruments   R 274 R 253    
Loans to associates   116 116    
Other loans   3 0    
Equity instruments   59 8    
Other non-current assets   1 3    
Total other non-current assets   R 334 264    
Subordinated And Unsecured Loan To ARM BBEE Trust | JIBAR          
Disclosure of financial assets [line items]          
Interest rate margin (as a percent)   4.25%      
ARM          
Disclosure of financial assets [line items]          
Ownership interest (as a percent) 14.29% 13.80%      
ARM BBEE Trust          
Disclosure of financial assets [line items]          
Loan to ARM BBEE Trust   R 271      
Loan to ARM BBEE Trust     256   R 200
Pamodzi          
Disclosure of financial assets [line items]          
Loans to associates   116 116    
Rand Mutual Assurance          
Disclosure of financial assets [line items]          
Equity instruments   52 0 R 0  
Other investments          
Disclosure of financial assets [line items]          
Equity instruments   7 8    
Debt instrument          
Disclosure of financial assets [line items]          
Loss allowance   R (116) R (119) R (162)