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Assets under construction - Asset rollforward (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Assets Under Construction [Line Items]      
Balance at beginning of period R 130,734    
Additions 52,806 R 60,312 R 70,849
Finance costs capitalised 3,568 2,764 2,253
Disposals and scrapping (1,200) (105) (963)
Balance at end of period 165,361 130,734  
Assets under construction      
Assets Under Construction [Line Items]      
Balance at beginning of period 130,734 104,011  
Additions 52,806 60,312  
to sustain existing operations 19,127 16,888  
to expand operations 33,679 43,424  
Net reclassification from/(to) other assets 9    
Finance costs capitalised 3,568 2,764  
Net impairment of assets under construction (1,790) (1,093)  
Reduction in rehabilitation provision capitalised (note 30) (472) (753)  
Projects capitalised (25,769) (23,673)  
Translation of foreign operations 7,475 (10,729)  
Disposals and scrapping (1,200) (105)  
Balance at end of period 165,361 130,734 104,011
Property, plant and equipment under construction      
Assets Under Construction [Line Items]      
Balance at beginning of period 129,124 102,185  
Additions 51,871 59,771  
to sustain existing operations 18,889 16,653  
to expand operations 32,982 43,118  
Net reclassification from/(to) other assets 42 (29)  
Finance costs capitalised 3,568 2,764  
Net impairment of assets under construction (1,478) (728)  
Reduction in rehabilitation provision capitalised (note 30) (341) (726)  
Projects capitalised (25,315) (23,433)  
Translation of foreign operations 7,464 (10,575)  
Disposals and scrapping (1,152) (105)  
Balance at end of period 163,783 129,124 102,185
Other intangible assets under development      
Assets Under Construction [Line Items]      
Balance at beginning of period 1,245 1,470  
Additions 321 313  
to sustain existing operations 238 235  
to expand operations 83 78  
Net reclassification from/(to) other assets (33) 29  
Net impairment of assets under construction   (176)  
Projects capitalised (454) (240)  
Translation of foreign operations 46 (151)  
Balance at end of period 1,125 1,245 1,470
Exploration and evaluation assets      
Assets Under Construction [Line Items]      
Balance at beginning of period 365 356  
Additions 614 228  
to expand operations 614 228  
Net impairment of assets under construction (312) (189)  
Reduction in rehabilitation provision capitalised (note 30) (131) (27)  
Translation of foreign operations (35) (3)  
Disposals and scrapping (48)    
Balance at end of period R 453 R 365 R 356