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Post-retirement benefit obligations - Reconciliation PBO, RF Contributions (Details) - Pension - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of net defined benefit liability (asset)    
Beginning balance R 7,009  
Ending balance 7,247 R 7,009
Reimbursement rights recognised in long-term receivables 112 122
Gain (loss) recognised in other comprehensive income (23) (14)
Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 83,883 76,056
Movements recognised in the income statement: 10,836 10,162
current service cost 1,606 1,585
interest cost 9,230 8,577
Actuarial losses/(gains) recognised in other comprehensive income: 1,819 2,081
arising from changes in financial assumptions 4,448 801
arising from change in actuarial experience (2,629) 1,280
Member contributions 658 601
Benefits paid (5,666) (4,460)
Translation of foreign operations 400 (557)
Ending balance 91,930 83,883
Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 7,919  
Ending balance 8,330 7,919
Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 75,964  
Ending balance 83,600 75,964
South Africa    
Disclosure of net defined benefit liability (asset)    
Beginning balance (92)  
Ending balance (113) (92)
South Africa | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 72,186 64,049
Movements recognised in the income statement: 9,961 9,268
current service cost 1,196 1,145
interest cost 8,765 8,123
Actuarial losses/(gains) recognised in other comprehensive income: 2,082 2,236
arising from changes in financial assumptions 4,652 911
arising from change in actuarial experience (2,570) 1,325
Member contributions 658 601
Benefits paid (4,944) (3,968)
Ending balance 79,943 72,186
South Africa | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 72,186  
Ending balance 79,943 72,186
Foreign Countries    
Disclosure of net defined benefit liability (asset)    
Beginning balance 7,101  
Ending balance 7,360 7,101
Foreign Countries | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 11,697 12,007
Movements recognised in the income statement: 875 894
current service cost 410 440
interest cost 465 454
Actuarial losses/(gains) recognised in other comprehensive income: (263) (155)
arising from changes in financial assumptions (204) (110)
arising from change in actuarial experience (59) (45)
Benefits paid (722) (492)
Translation of foreign operations 400 (557)
Ending balance 11,987 11,697
Foreign Countries | Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 7,919  
Ending balance 8,330 7,919
Foreign Countries | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 3,778  
Ending balance R 3,657 R 3,778