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Post-retirement benefit obligations - Reconciliation PBO, RF Contributions (Details) - Pension - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of net defined benefit liability (asset)    
Beginning balance R 6,179  
Ending balance 7,445 R 6,179
Reimbursement rights recognised in long-term receivables 137 135
Gain (loss) recognised in other comprehensive income (42) (88)
Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 70,508 70,322
Movements recognised in the income statement: 9,310 7,934
current service cost 1,564 1,549
interest cost 7,746 6,385
Actuarial (gains) losses recognised in other comprehensive income: (1,835) (3,184)
arising from changes in financial assumptions (141) (4,787)
arising from change in actuarial experience (1,694) 1,603
Member contributions 562 536
Benefits paid (4,385) (4,401)
Disposal of business   (1,223)
Translation of foreign operations 1,896 524
Ending balance 76,056 70,508
Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 6,812  
Ending balance 8,229 6,812
Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 63,696  
Ending balance 67,827 63,696
South Africa    
Disclosure of net defined benefit liability (asset)    
Beginning balance (64)  
Ending balance (84) (64)
South Africa | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 60,478 57,054
Movements recognised in the income statement: 8,426 7,326
current service cost 1,066 1,115
interest cost 7,360 6,211
Actuarial (gains) losses recognised in other comprehensive income: (1,482) (533)
arising from changes in financial assumptions 421 (2,133)
arising from change in actuarial experience (1,903) 1,600
Member contributions 562 536
Benefits paid (3,935) (3,905)
Ending balance 64,049 60,478
South Africa | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 60,478  
Ending balance 64,049 60,478
Foreign Countries    
Disclosure of net defined benefit liability (asset)    
Beginning balance 6,243  
Ending balance 7,529 6,243
Foreign Countries | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 10,030 13,268
Movements recognised in the income statement: 884 608
current service cost 498 434
interest cost 386 174
Actuarial (gains) losses recognised in other comprehensive income: (353) (2,651)
arising from changes in financial assumptions (562) (2,654)
arising from change in actuarial experience 209 3
Benefits paid (450) (496)
Disposal of business   (1,223)
Translation of foreign operations 1,896 524
Ending balance 12,007 10,030
Foreign Countries | Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 6,812  
Ending balance 8,229 6,812
Foreign Countries | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 3,218  
Ending balance R 3,778 R 3,218