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Other Reserves - Narrative (Details) - ZAR (R)
R in Millions
Mar. 19, 2010
Mar. 15, 2004
Jun. 30, 2019
Jun. 30, 2018
Disclosure of reserves within equity [line items]        
Acquisition of non-controlling interest in subsidiary     R (381) R (381)
Reserve for equity instruments designated at fair value through other comprehensive income     79 R 0
Abelle Limited        
Disclosure of reserves within equity [line items]        
Purchase price   R 579    
Acquisition of non-controlling interest in subsidiary   R 381    
Doornkop South Reef | AVRD        
Disclosure of reserves within equity [line items]        
Share of mining titles acquired (as a percent) 26.00%      
Shares issued in exchange for interest in mining titles (in shares) 2,162,359      
Difference between the value of shares issued R 152      
Rand Mutual Assurance        
Disclosure of reserves within equity [line items]        
Reserve for equity instruments designated at fair value through other comprehensive income     R 82