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Post-retirement benefit obligations - Reconciliation PBO, RF Contributions (Details) - Pension - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of net defined benefit liability (asset)    
Beginning balance R 11,352  
Ending balance 9,490 R 11,352
Reimbursement rights recognised in long-term receivables 218 270
Gain (loss) recognised in other comprehensive income (22) 2
Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 63,549 63,806
Movements recognised in the income statement: 7,248 7,073
current service cost 1,502 1,722
past service cost   39
curtailments and settlements (129)  
interest cost 5,875 5,312
Actuarial (gains) losses recognised in other comprehensive income: 5,715 (6,921)
arising from changes in demographic assumptions (1) 16
arising from changes in financial assumptions (149) (363)
arising from change in actuarial experience 5,865 (6,574)
Member contributions 503 504
Benefits paid (4,411) (3,785)
Translation of foreign operations (2,282) 2,872
Ending balance 70,322 63,549
Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 11,564  
Ending balance 10,028 11,564
Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 51,985  
Ending balance 60,294 51,985
South Africa    
Disclosure of net defined benefit liability (asset)    
Beginning balance (467)  
Ending balance (46) (467)
South Africa | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 47,228 51,241
Movements recognised in the income statement: 6,571 6,218
current service cost 923 1,150
interest cost 5,648 5,068
Actuarial (gains) losses recognised in other comprehensive income: 6,093 (7,938)
arising from changes in financial assumptions 303 (1,105)
arising from change in actuarial experience 5,790 (6,833)
Member contributions 503 504
Benefits paid (3,341) (2,797)
Ending balance 57,054 47,228
South Africa | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 47,228  
Ending balance 57,054 47,228
Foreign Countries    
Disclosure of net defined benefit liability (asset)    
Beginning balance 11,819  
Ending balance 9,536 11,819
Foreign Countries | Benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 16,321 12,565
Movements recognised in the income statement: 677 855
current service cost 579 572
past service cost   39
curtailments and settlements (129)  
interest cost 227 244
Actuarial (gains) losses recognised in other comprehensive income: (378) 1,017
arising from changes in demographic assumptions (1) 16
arising from changes in financial assumptions (452) 742
arising from change in actuarial experience 75 259
Benefits paid (1,070) (988)
Translation of foreign operations (2,282) 2,872
Ending balance 13,268 16,321
Foreign Countries | Benefit obligation | Unfunded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 11,564  
Ending balance 10,028 11,564
Foreign Countries | Benefit obligation | Funded benefit obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance 4,757  
Ending balance R 3,240 R 4,757