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Property, Plant and Equipment - Mining assets (Narrative) (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Mar. 01, 2018
Disclosure of detailed information about property, plant and equipment [line items]        
Depreciation expense R 4,054 R 2,570 R 2,519  
Life-of-mine plans (term) 5 years      
Moab Khotsong        
Disclosure of detailed information about property, plant and equipment [line items]        
Fair value of property, plant and equipment acquired R 0 3,691   R 3,691
Mining assets        
Disclosure of detailed information about property, plant and equipment [line items]        
Stripping activities 1,208 261    
Depreciation expense, capitalised stripping costs R 13 R 4    
Mining assets | Moab Khotsong        
Disclosure of detailed information about property, plant and equipment [line items]        
Fair value of property, plant and equipment acquired       3,554
Other non-mining assets | Moab Khotsong        
Disclosure of detailed information about property, plant and equipment [line items]        
Fair value of property, plant and equipment acquired       R 137
Hidden Valley        
Disclosure of detailed information about property, plant and equipment [line items]        
Post-tax real discount rate 10.13% 9.91% 11.92%  
Transferred to mining assets R 607 R 2,707    
Tshepong        
Disclosure of detailed information about property, plant and equipment [line items]        
Transferred to mining assets   R 410    
Bottom of range | Moab Khotsong        
Disclosure of detailed information about property, plant and equipment [line items]        
Post-tax real discount rate       8.20%
Bottom of range | South African operations        
Disclosure of detailed information about property, plant and equipment [line items]        
Post-tax real discount rate 8.90% 8.35% 8.98%  
Top of range | Moab Khotsong        
Disclosure of detailed information about property, plant and equipment [line items]        
Post-tax real discount rate       11.30%
Top of range | South African operations        
Disclosure of detailed information about property, plant and equipment [line items]        
Post-tax real discount rate 11.10% 10.25% 11.81%  
Had the group only used proved and probable reserves in its calculations        
Disclosure of detailed information about property, plant and equipment [line items]        
Depreciation expense R 4,116 R 2,753 R 2,727