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Property, plant and equipment (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Property, plant and equipment      
Carrying amount at beginning of the year R 158,773 R 155,054  
Additions 6,992 1,112 R 6,545
Additions, to sustain existing operations 4,606 623  
Additions, to expand operations 2,386 489  
Net reclassification from/(to) other assets   39  
Reduction in rehabilitation provisions capitalised (note 31) (961) (1,400)  
Disposal of business (24) (53)  
Projects capitalised 25,316 23,433  
Reclassification (to)/from held for sale (41) 515  
Translation of foreign operations 1,639 (3,191)  
Disposal and scrapping (567) (783)  
Current year depreciation charge (16,047) (15,810)  
Net impairment of property, plant and equipment (7,623) (143)  
Carrying amount at ending of the year 167,457 158,773 155,054
Cost      
Property, plant and equipment      
Carrying amount at beginning of the year 298,758 291,650  
Carrying amount at ending of the year 328,336 298,758 291,650
Accumulated depreciation and impairment      
Property, plant and equipment      
Carrying amount at beginning of the year (139,985) (136,596)  
Carrying amount at ending of the year (160,879) (139,985) (136,596)
Land      
Property, plant and equipment      
Carrying amount at beginning of the year 1,357 1,329  
Additions 5    
Additions, to sustain existing operations 5    
Net reclassification from/(to) other assets 3    
Projects capitalised 1,268    
Reclassification (to)/from held for sale 15 514  
Translation of foreign operations 113 (58)  
Disposal and scrapping (17) (362)  
Net impairment of property, plant and equipment   (66)  
Carrying amount at ending of the year 2,744 1,357 1,329
Land | Cost      
Property, plant and equipment      
Carrying amount at beginning of the year 1,630 1,559  
Carrying amount at ending of the year 3,036 1,630 1,559
Land | Accumulated depreciation and impairment      
Property, plant and equipment      
Carrying amount at beginning of the year (273) (230)  
Carrying amount at ending of the year (292) (273) (230)
Buildings and improvements      
Property, plant and equipment      
Carrying amount at beginning of the year 7,851 6,522  
Additions 367 349  
Additions, to sustain existing operations 29 26  
Additions, to expand operations 338 323  
Net reclassification from/(to) other assets (171) 46  
Reduction in rehabilitation provisions capitalised (note 31) (2) (18)  
Disposal of business   (10)  
Projects capitalised 928 1,631  
Reclassification (to)/from held for sale (6) 1  
Translation of foreign operations 151 (172)  
Disposal and scrapping (9) (16)  
Current year depreciation charge (572) (500)  
Net impairment of property, plant and equipment   18  
Carrying amount at ending of the year 8,537 7,851 6,522
Buildings and improvements | Cost      
Property, plant and equipment      
Carrying amount at beginning of the year 14,231 12,846  
Carrying amount at ending of the year 15,652 14,231 12,846
Buildings and improvements | Accumulated depreciation and impairment      
Property, plant and equipment      
Carrying amount at beginning of the year (6,380) (6,324)  
Carrying amount at ending of the year (7,115) (6,380) (6,324)
Plant, equipment and vehicles      
Property, plant and equipment      
Carrying amount at beginning of the year 117,699 113,274  
Additions 6,327 705  
Additions, to sustain existing operations 4,279 528  
Additions, to expand operations 2,048 177  
Net reclassification from/(to) other assets 169 (9)  
Reduction in rehabilitation provisions capitalised (note 31) (85) (94)  
Disposal of business (24) (43)  
Projects capitalised 19,990 18,106  
Reclassification (to)/from held for sale (50)    
Translation of foreign operations 1,512 (2,064)  
Disposal and scrapping (428) (363)  
Current year depreciation charge (12,445) (11,521)  
Net impairment of property, plant and equipment (5,329) (292)  
Carrying amount at ending of the year 127,336 117,699 113,274
Plant, equipment and vehicles | Cost      
Property, plant and equipment      
Carrying amount at beginning of the year 215,017 207,102  
Carrying amount at ending of the year 239,262 215,017 207,102
Plant, equipment and vehicles | Accumulated depreciation and impairment      
Property, plant and equipment      
Carrying amount at beginning of the year (97,318) (93,828)  
Carrying amount at ending of the year (111,926) (97,318) (93,828)
Mineral assets      
Property, plant and equipment      
Carrying amount at beginning of the year 31,866 33,929  
Additions 293 58  
Additions, to sustain existing operations 293 69  
Additions, to expand operations   (11)  
Net reclassification from/(to) other assets (1) 2  
Reduction in rehabilitation provisions capitalised (note 31) (874) (1,288)  
Projects capitalised 3,130 3,696  
Translation of foreign operations (137) (897)  
Disposal and scrapping (113) (42)  
Current year depreciation charge (3,030) (3,789)  
Net impairment of property, plant and equipment (2,294) 197  
Carrying amount at ending of the year 28,840 31,866 33,929
Mineral assets | Cost      
Property, plant and equipment      
Carrying amount at beginning of the year 67,880 70,143  
Carrying amount at ending of the year 70,386 67,880 70,143
Mineral assets | Accumulated depreciation and impairment      
Property, plant and equipment      
Carrying amount at beginning of the year (36,014) (36,214)  
Carrying amount at ending of the year R (41,546) R (36,014) R (36,214)