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Share-Based Payments - Activity on Share Options (Details)
 12 Months Ended
Jun. 30, 2019
ZAR (R)
shares
year
Jun. 30, 2018
ZAR (R)
shares
2006 share plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Options granted (in shares) 0  
Number of options and rights (in shares) 27,720,640  
Gain realised by participants on options and rights traded during the year | R R 484,000,000 R 164,000,000
Fair value of options and rights exercised during the year | R R 489,000,000 R 181,000,000
SARs | 2006 share plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Number of options and rights (in shares) 9,847,860 12,476,697
Weighted average option price (in SA rand per share) | R R 50.20 R 32.60
Options granted (in shares)   0
Options granted (in SA rand per share) | R   R 0.00
Options exercised or vested (in shares) (1,564,486) (794,351)
Options exercised (in SA rand per share) | R R 27.50 R 24.37
Options forfeited and lapsed (in shares) (1,570,330) (1,834,486)
Options forfeited and lapsed (in SA rand per share) | R R 56.29 R 52.86
Number of options and rights (in shares) 6,713,044 9,847,860
Weighted average option price (in SA rand per share) | R R 26.45 R 50.20
Options and rights vested but not exercised (in shares) 5,692,965 5,331,335
Weighted average option price (in SA rand per share) | R R 27.89 R 36.26
PS | 2006 share plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Number of options and rights (in shares) 42,427,284 37,848,573
Options granted (in shares)   14,406,437
Options exercised or vested (in shares) (20,166,093) (3,873,467)
Options forfeited and lapsed (in shares) (1,253,595) (5,954,259)
Number of options and rights (in shares) 21,007,596 42,427,284
RS | 2006 share plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Number of options and rights (in shares) 550,996 701,412
Options granted (in shares)   0
Options exercised or vested (in shares) (550,996) (120,000)
Options forfeited and lapsed (in shares) 0 (30,416)
Number of options and rights (in shares) 0 550,996
PS and RS | 2006 share plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Options and rights vested but not exercised (in shares) 0 0
PU | Sisonke ESOP    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Number of options and rights (in shares) 0 0
Options granted (in shares) 6,974,500 0
Options exercised or vested (in shares) (107,100) 0
Options forfeited and lapsed (in shares) (48,375) 0
Number of options and rights (in shares) 6,819,025 0
Weighted average option price (in SA rand per share) | R R 27.16  
Gain realised by participants on options and rights traded during the year | R R 3,000,000  
Remaining life (years) | year 2.5