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Derivative Financial Instruments - Disclosure of Derivative Financial Assets and Liabilities (Details)
R in Millions
 12 Months Ended
Jun. 30, 2019
ZAR (R)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2017
ZAR (R)
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets R 506 R 623  
Non-current 197 84  
Current 309 539  
Derivative financial liabilities (442) (215)  
Non-current (172) (10)  
Current (270) (205)  
Net derivative financial instruments 64 408  
Unamortised day one net loss included above 41 11  
Realised gains included in revenue 453 1,197 R 728
Unrealised gains/(losses) included in other reserves (214) 413 1,143
Gains/(losses) included in gains on derivatives 516 136 1,103
Hedge ineffectiveness     16
Day one loss amortisation (32) (37) (94)
Total gains on derivatives 484 99 1,025
Hedge effectiveness      
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness 239    
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. (239)    
Rand gold hedging contracts      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 45 482  
Non-current 23 70  
Current 22 412  
Derivative financial liabilities (383) (12)  
Non-current (158) (10)  
Current (225) (2)  
Net derivative financial instruments (338) 470  
Unamortised day one net loss included above 36 11  
Realised gains included in revenue 453 1,197 728
Unrealised gains/(losses) included in other reserves (165) 413  
Gains/(losses) included in gains on derivatives (51) (12) 0
Hedge ineffectiveness     16
Day one loss amortisation (31) (37) (94)
Total gains on derivatives (82) (49) (78)
Hedge effectiveness      
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness 288    
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. (288)    
US$ commodity contracts      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 5 74  
Non-current 1 11  
Current 4 63  
Derivative financial liabilities (57) 0  
Non-current (14) 0  
Current (43) 0  
Net derivative financial instruments (52) 74  
Unamortised day one net loss included above 5 0  
Realised gains included in revenue 0 0 0
Unrealised gains/(losses) included in other reserves (49) 0  
Gains/(losses) included in gains on derivatives 13 35 20
Hedge ineffectiveness     0
Day one loss amortisation (1) 0 0
Total gains on derivatives 12 35 20
Hedge effectiveness      
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness (49)    
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. 49    
Foreign exchange hedging contracts      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 456 67  
Non-current 173 3  
Current 283 64  
Derivative financial liabilities (2) (203)  
Non-current 0 0  
Current (2) (203)  
Net derivative financial instruments 454 (136)  
Unamortised day one net loss included above 0 0  
Realised gains included in revenue 0 0 0
Unrealised gains/(losses) included in other reserves 0 0  
Gains/(losses) included in gains on derivatives 554 113 1,083
Hedge ineffectiveness     0
Day one loss amortisation 0 0 0
Total gains on derivatives 554 R 113 R 1,083
Hedge effectiveness      
Cumulative changes in the fair value of the hedging instrument used as the basis for recognising hedge ineffectiveness 0    
Cumulative changes in the fair value of the hedged item used as the basis for recognising hedge ineffectiveness. R 0    
Designated as hedging instrument | Gold derivative contracts      
Hedge effectiveness      
Hedge ratio 1