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Assets under construction - Asset rollforward (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Assets under construction      
Balance at beginning of year R 165,361    
Additions 53,142 R 52,806 R 60,312
Finance costs capitalised 6,942 3,568 2,764
Disposals and scrapping (852) (1,200) (105)
Balance at end of year 127,764 165,361  
Assets under construction      
Assets under construction      
Balance at beginning of year 165,361 130,734  
Additions 53,142 52,806  
to sustain existing operations 21,984 19,127  
to expand operations 31,158 33,679  
Net reclassification from/(to) other assets 230 9  
Finance costs capitalised 6,942 3,568  
Net impairment of assets under construction (4,007) (1,790)  
Reclassification to disposal groups held for sale (153)    
Reduction in rehabilitation provision capitalised (note 30)   (472)  
Projects capitalised (96,900) (25,769)  
Translation of foreign operations 4,001 7,475  
Disposals and scrapping (852) (1,200)  
Balance at end of year 127,764 165,361 130,734
Property, plant and equipment under construction      
Assets under construction      
Balance at beginning of year 163,783 129,124  
Additions 52,786 51,871  
to sustain existing operations 21,739 18,889  
to expand operations 31,047 32,982  
Net reclassification from/(to) other assets (93) 42  
Finance costs capitalised 6,942 3,568  
Net impairment of assets under construction (3,973) (1,478)  
Reclassification to disposal groups held for sale (153)    
Reduction in rehabilitation provision capitalised (note 30)   (341)  
Projects capitalised (96,084) (25,315)  
Translation of foreign operations 3,971 7,464  
Disposals and scrapping (852) (1,152)  
Balance at end of year 126,327 163,783 129,124
Other intangible assets under development      
Assets under construction      
Balance at beginning of year 1,125 1,245  
Additions 289 321  
to sustain existing operations 245 238  
to expand operations 44 83  
Net reclassification from/(to) other assets   (33)  
Projects capitalised (816) (454)  
Translation of foreign operations 29 46  
Balance at end of year 627 1,125 1,245
Exploration and evaluation assets      
Assets under construction      
Balance at beginning of year 453 365  
Additions 67 614  
to expand operations 67 614  
Net reclassification from/(to) other assets 323    
Net impairment of assets under construction (34) (312)  
Reduction in rehabilitation provision capitalised (note 30)   (131)  
Translation of foreign operations 1 (35)  
Disposals and scrapping   (48)  
Balance at end of year R 810 R 453 R 365