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Share-based Payments - Equity-settled Plans (Details)
12 Months Ended
Dec. 31, 2019
ZAR (R)
shares
Dec. 31, 2018
ZAR (R)
shares
Dec. 31, 2017
ZAR (R)
shares
Dec. 31, 2015
ZAR (R)
Bonus Share Plan (BSP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Calculated fair value | R   R 119.14 R 152.87  
Awards outstanding at beginning of year (in shares) 4,557,919 4,479,679 4,198,285  
Awards granted during the year (in shares) 0 2,492,584 1,926,549  
Awards lapsed during the year (in shares) (109,065) (359,343) (218,601)  
Awards exercised during the year (in shares) (2,307,439) (2,055,001) (1,426,554)  
Awards outstanding at end of year (in shares) 2,141,415 4,557,919 4,479,679  
Awards exercisable at end of year (in shares) 1,207,936 1,588,512 1,904,021  
Deferred Share Plan (DSP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Calculated fair value | R R 204.42      
Awards granted during the year (in shares) 1,669,191      
Awards lapsed during the year (in shares) (55,208)      
Awards exercised during the year (in shares) (14,623)      
Awards outstanding at end of year (in shares) 1,599,360      
Long Term Incentive Plan (LTIP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Calculated fair value | R       R 129.94
Awards outstanding at beginning of year (in shares) 447,842 2,466,357 4,363,330  
Awards lapsed during the year (in shares) 0 (1,186,330) (1,512,857)  
Awards exercised during the year (in shares) (218,203) (832,185) (384,116)  
Awards outstanding at end of year (in shares) 229,639 447,842 2,466,357  
Awards exercisable at end of year (in shares) 229,639 447,842 455,914  
Co-investment Plan (CIP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Awards outstanding at beginning of year (in shares) 112,578 95,378 97,651  
Awards granted during the year (in shares) 0 80,809 112,105  
Awards lapsed during the year (in shares) (16,500) (11,633) (62,775)  
Awards matched during the year (in shares) (72,151) (51,976) (51,603)  
Awards outstanding at end of year (in shares) 23,927 112,578 95,378  
Tranche One | Bonus Share Plan (BSP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 50.00%      
Tranche One | DSP 2 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 50.00%      
Tranche One | DSP 3 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 33.00%      
Tranche One | DSP 5 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 20.00%      
Tranche Two | Bonus Share Plan (BSP)        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 50.00%      
Tranche Two | DSP 2 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 50.00%      
Tranche Two | DSP 3 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 33.00%      
Tranche Two | DSP 5 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 20.00%      
Tranche three | DSP 3 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 34.00%      
Tranche three | DSP 5 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 20.00%      
Tranche four | DSP 5 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 20.00%      
Tranche five | DSP 5 year        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Award vesting percentage 20.00%