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Lease - Right of use assets (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year R 12,351 R 11,685
Additions 1,953 2,844
Modifications and reassessments 689 863
Reclassification to assets (129)  
Translation of foreign operations 10 (241)
Terminations (154) (156)
Current year depreciation charge (2,503) (2,478)
Net impairment of right of use assets (383) (166)
Carrying amount at end of year 11,834 12,351
Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 117 127
Additions 13 11
Modifications and reassessments   (6)
Translation of foreign operations 7 (5)
Terminations (17)  
Current year depreciation charge (8) (10)
Net impairment of right of use assets 142  
Carrying amount at end of year 254 117
Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 5,101 4,712
Additions 868 1,274
Modifications and reassessments 35 (13)
Translation of foreign operations 28 (45)
Terminations (5) (99)
Current year depreciation charge (553) (627)
Net impairment of right of use assets (352) (101)
Carrying amount at end of year 5,122 5,101
Plant, equipment and vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 7,133 6,845
Additions 1,072 1,559
Modifications and reassessments 654 882
Reclassification to assets (129)  
Translation of foreign operations (25) (191)
Terminations (132) (57)
Current year depreciation charge (1,942) (1,840)
Net impairment of right of use assets (173) (65)
Carrying amount at end of year 6,458 7,133
Mineral assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year   1
Current year depreciation charge   (1)
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 23,892 21,775
Carrying amount at end of year 24,885 23,892
Cost | Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 326 333
Carrying amount at end of year 305 326
Cost | Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 8,919 8,264
Carrying amount at end of year 9,840 8,919
Cost | Plant, equipment and vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year 14,647 13,174
Carrying amount at end of year 14,740 14,647
Cost | Mineral assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year   4
Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year (11,541) (10,090)
Carrying amount at end of year (13,051) (11,541)
Accumulated depreciation and impairment | Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year (209) (206)
Carrying amount at end of year (51) (209)
Accumulated depreciation and impairment | Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year (3,818) (3,552)
Carrying amount at end of year (4,718) (3,818)
Accumulated depreciation and impairment | Plant, equipment and vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year (7,514) (6,329)
Carrying amount at end of year R (8,282) (7,514)
Accumulated depreciation and impairment | Mineral assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Carrying amount at beginning of year   R (3)