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Property, plant and equipment (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Property, plant and equipment      
Amount at beginning of the year R 227,645 R 357,582  
Additions 16,022 38,092 R 55,862
Additions, to sustain existing operations 14,801 21,148  
Additions, to expand operations 1,221 16,944  
Net reclassification (to)/from other assets 46 120  
Reduction in rehabilitation provisions capitalised (2,425) (183)  
Establishment of joint operation 29,563    
Disposal of business (6,607)    
Finance costs capitalised 880 3,520  
Projects capitalised (470) (543)  
Reclassification from/(to) held for sale (1,689)    
Reclassification to held for sale   (73,713)  
Translation of foreign operations (21,034) 39,800  
Disposals and scrapping (457) (1,431)  
Current year depreciation charge (14,920) (19,579)  
Net impairment of property, plant and equipment (28,533) (108,532)  
Amount at end of the year R 198,021 227,645 357,582
Gemini HDPE LLC      
Property, plant and equipment      
Proportion of equity interest disposed of 50.00%    
Previously reported      
Property, plant and equipment      
Amount at beginning of the year   361,313  
Amount at beginning of the year R 204,470 233,549  
Amount at end of the year   204,470 233,549
Revision      
Property, plant and equipment      
Amount at beginning of the year (4,627) (3,731)  
Amount at end of the year   (4,627) (3,731)
Cost      
Property, plant and equipment      
Amount at beginning of the year 465,723 546,518  
Amount at end of the year 432,779 465,723 546,518
Accumulated depreciation and impairment      
Property, plant and equipment      
Amount at beginning of the year (238,078) (188,936)  
Amount at end of the year (234,758) (238,078) (188,936)
Land      
Property, plant and equipment      
Amount at beginning of the year 5,591 4,202  
Additions 18 34  
Additions, to sustain existing operations 18 34  
Net reclassification (to)/from other assets (2) (11)  
Establishment of joint operation 325    
Disposal of business (1,399)    
Projects capitalised 73 920  
Reclassification from/(to) held for sale 98    
Reclassification to held for sale   (112)  
Translation of foreign operations (775) 842  
Disposals and scrapping (2) (268)  
Net impairment of property, plant and equipment (56) (10)  
Amount at end of the year 3,871 5,591 4,202
Land | Previously reported      
Property, plant and equipment      
Amount at beginning of the year   4,202  
Land | Cost      
Property, plant and equipment      
Amount at beginning of the year 5,844 4,403  
Amount at end of the year 4,145 5,844 4,403
Land | Accumulated depreciation and impairment      
Property, plant and equipment      
Amount at beginning of the year (253) (201)  
Amount at end of the year (274) (253) (201)
Buildings and improvements      
Property, plant and equipment      
Amount at beginning of the year 11,954 15,434  
Additions 4 59  
Additions, to sustain existing operations   42  
Additions, to expand operations 4 17  
Net reclassification (to)/from other assets 56 (295)  
Reduction in rehabilitation provisions capitalised (4)    
Establishment of joint operation 1,097    
Disposal of business (632)    
Projects capitalised 837 3,035  
Reclassification from/(to) held for sale 349    
Reclassification to held for sale   (2,350)  
Translation of foreign operations (1,457) 2,091  
Disposals and scrapping (19) (6)  
Current year depreciation charge (537) (720)  
Net impairment of property, plant and equipment (94) (3,819)  
Amount at end of the year 11,554 11,954 15,434
Buildings and improvements | Previously reported      
Property, plant and equipment      
Amount at beginning of the year   15,434  
Buildings and improvements | Cost      
Property, plant and equipment      
Amount at beginning of the year 21,418 23,034  
Amount at end of the year 20,462 21,418 23,034
Buildings and improvements | Accumulated depreciation and impairment      
Property, plant and equipment      
Amount at beginning of the year (9,464) (7,600)  
Amount at end of the year (8,908) (9,464) (7,600)
Plant, equipment and vehicles      
Property, plant and equipment      
Amount at beginning of the year 152,255 181,504  
Additions 1,063 1,039  
Additions, to sustain existing operations 948 825  
Additions, to expand operations 115 214  
Net reclassification (to)/from other assets (750) 447  
Reduction in rehabilitation provisions capitalised (55) (23)  
Establishment of joint operation 28,079    
Disposal of business (4,544)    
Projects capitalised 11,918 120,616  
Reclassification from/(to) held for sale (711)    
Reclassification to held for sale   (61,754)  
Translation of foreign operations (18,327) 23,761  
Disposals and scrapping (184) (484)  
Current year depreciation charge (11,080) (15,568)  
Net impairment of property, plant and equipment (28,678) (91,347)  
Amount at end of the year 128,986 152,255 181,504
Plant, equipment and vehicles | Previously reported      
Property, plant and equipment      
Amount at beginning of the year   185,235  
Plant, equipment and vehicles | Revision      
Property, plant and equipment      
Amount at beginning of the year   (3,731)  
Amount at end of the year     (3,731)
Plant, equipment and vehicles | Cost      
Property, plant and equipment      
Amount at beginning of the year 325,837 316,548  
Amount at end of the year 334,432 325,837 316,548
Plant, equipment and vehicles | Accumulated depreciation and impairment      
Property, plant and equipment      
Amount at beginning of the year (173,582) (135,044)  
Amount at end of the year (205,446) (173,582) (135,044)
Mineral assets      
Property, plant and equipment      
Amount at beginning of the year 30,043 28,678  
Additions 43 1,230  
Additions, to sustain existing operations 43 1,230  
Net reclassification (to)/from other assets 20 (4)  
Reduction in rehabilitation provisions capitalised (1,401) (160)  
Disposal of business (1)    
Projects capitalised 2,654 3,378  
Reclassification from/(to) held for sale (981)    
Translation of foreign operations 98 230  
Disposals and scrapping (49) (18)  
Current year depreciation charge (3,303) (3,291)  
Net impairment of property, plant and equipment 353    
Amount at end of the year 27,476 30,043 28,678
Mineral assets | Previously reported      
Property, plant and equipment      
Amount at beginning of the year   28,678  
Mineral assets | Cost      
Property, plant and equipment      
Amount at beginning of the year 84,822 74,769  
Amount at end of the year 47,606 84,822 74,769
Mineral assets | Accumulated depreciation and impairment      
Property, plant and equipment      
Amount at beginning of the year (54,779) (46,091)  
Amount at end of the year (20,130) (54,779) (46,091)
Assets under construction      
Property, plant and equipment      
Amount at beginning of the year 27,802 127,764  
Additions 14,894 35,730  
Additions, to sustain existing operations 13,792 19,017  
Additions, to expand operations 1,102 16,713  
Net reclassification (to)/from other assets 722 (17)  
Reduction in rehabilitation provisions capitalised (965)    
Establishment of joint operation 62    
Disposal of business (31)    
Finance costs capitalised 880 3,520  
Projects capitalised (15,952) (128,492)  
Reclassification from/(to) held for sale (444)    
Reclassification to held for sale   (9,497)  
Translation of foreign operations (573) 12,876  
Disposals and scrapping (203) (655)  
Net impairment of property, plant and equipment (58) (13,356)  
Amount at end of the year 26,134 27,802 127,764
Assets under construction | Previously reported      
Property, plant and equipment      
Amount at beginning of the year   127,764  
Assets under construction | Cost      
Property, plant and equipment      
Amount at beginning of the year 27,802 127,764  
Amount at end of the year R 26,134 27,802 127,764
Transfer of finance leases on application of IFRS 16      
Property, plant and equipment      
Amount at beginning of the year   (7,488)  
Amount at end of the year     (7,488)
Transfer of finance leases on application of IFRS 16 | Land      
Property, plant and equipment      
Amount at beginning of the year   (6)  
Amount at end of the year     (6)
Transfer of finance leases on application of IFRS 16 | Buildings and improvements      
Property, plant and equipment      
Amount at beginning of the year   (1,475)  
Amount at end of the year     (1,475)
Transfer of finance leases on application of IFRS 16 | Plant, equipment and vehicles      
Property, plant and equipment      
Amount at beginning of the year   (5,936)  
Amount at end of the year     (5,936)
Transfer of finance leases on application of IFRS 16 | Assets under construction      
Property, plant and equipment      
Amount at beginning of the year   (71)  
Amount at end of the year     (71)
After application of IFRS 16      
Property, plant and equipment      
Amount at beginning of the year   350,094  
Amount at end of the year     350,094
After application of IFRS 16 | Land      
Property, plant and equipment      
Amount at beginning of the year   4,196  
Amount at end of the year     4,196
After application of IFRS 16 | Buildings and improvements      
Property, plant and equipment      
Amount at beginning of the year   13,959  
Amount at end of the year     13,959
After application of IFRS 16 | Plant, equipment and vehicles      
Property, plant and equipment      
Amount at beginning of the year   175,568  
Amount at end of the year     175,568
After application of IFRS 16 | Mineral assets      
Property, plant and equipment      
Amount at beginning of the year   28,678  
Amount at end of the year     28,678
After application of IFRS 16 | Assets under construction      
Property, plant and equipment      
Amount at beginning of the year   R 127,693  
Amount at end of the year     R 127,693