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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, 2023
Jun. 30, 2022
Disclosure of net defined benefit liability (asset)    
Beginning balance R (6,179)  
Ending balance (7,445) R (6,179)
Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 70,071 64,403
Movements recognised in the income statement: 8,259 6,699
interest income 8,259 6,699
Actuarial gains (losses) recognised in other comprehensive income: (2,884) 963
arising from return on plan assets (excluding interest income) (2,884) 963
Plan participant contributions 562 536
Employer contribution 1,306 1,199
Benefits payments (4,147) (4,217)
Translation of foreign operations 602 488
Ending balance 73,769 70,071
Actual return on plan assets 5,376 7,662
South Africa    
Disclosure of net defined benefit liability (asset)    
Beginning balance 64  
Ending balance 84 64
South Africa | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Projected pension contributions for next fiscal year 1,305  
South Africa | Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 66,284 60,671
Movements recognised in the income statement: 8,084 6,610
interest income 8,084 6,610
Actuarial gains (losses) recognised in other comprehensive income: (2,939) 1,200
arising from return on plan assets (excluding interest income) (2,939) 1,200
Plan participant contributions 562 536
Employer contribution 1,235 1,172
Benefits payments (3,935) (3,905)
Ending balance 69,291 66,284
Actual return on plan assets 5,145 7,810
Foreign Countries    
Disclosure of net defined benefit liability (asset)    
Beginning balance (6,243)  
Ending balance (7,529) (6,243)
Foreign Countries | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Projected pension contributions for next fiscal year 75  
Foreign Countries | Plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 3,787 3,732
Movements recognised in the income statement: 175 89
interest income 175 89
Actuarial gains (losses) recognised in other comprehensive income: 55 (237)
arising from return on plan assets (excluding interest income) 55 (237)
Employer contribution 71 27
Benefits payments (212) (312)
Translation of foreign operations 602 488
Ending balance 4,478 3,787
Actual return on plan assets R 231 R (148)