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Post-retirement benefit obligations - Reconciliation Plan Assets, 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)
Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 83,985 73,769
Movements recognised in the income statement: 9,640 8,998
interest income 9,640 8,998
Actuarial (losses)/gains recognised in other comprehensive income: 1,559 3,575
arising from return on plan assets (excluding interest income) 1,559 3,575
Plan participant contributions 658 601
Employer contributions 1,401 1,383
Benefits payments (5,363) (4,181)
Translation of foreign operations (112) (160)
Ending balance 91,768 83,985
Actual return on plan assets 11,199 12,573
South Africa    
Disclosure of net defined benefit liability (asset)    
Beginning balance 92  
Ending balance 113 92
South Africa | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Projected pension contributions for next fiscal year 1,402  
South Africa | Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 79,389 69,291
Movements recognised in the income statement: 9,420 8,802
interest income 9,420 8,802
Actuarial (losses)/gains recognised in other comprehensive income: 1,283 3,351
arising from return on plan assets (excluding interest income) 1,283 3,351
Plan participant contributions 658 601
Employer contributions 1,335 1,312
Benefits payments (4,944) (3,968)
Ending balance 87,141 79,389
Actual return on plan assets 10,703 12,153
Foreign Countries    
Disclosure of net defined benefit liability (asset)    
Beginning balance (7,101)  
Ending balance (7,360) (7,101)
Foreign Countries | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Projected pension contributions for next fiscal year 66  
Foreign Countries | Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 4,596 4,478
Movements recognised in the income statement: 220 196
interest income 220 196
Actuarial (losses)/gains recognised in other comprehensive income: 276 224
arising from return on plan assets (excluding interest income) 276 224
Employer contributions 66 71
Benefits payments (419) (213)
Translation of foreign operations (112) (160)
Ending balance 4,627 4,596
Actual return on plan assets R 496 R 420