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Post-retirement benefit obligations - Reconciliation PBO, RF Contributions (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of net defined benefit liability (asset)      
Gain (loss) recognised in other comprehensive income R (83) R (1) R (50)
Pension      
Disclosure of net defined benefit liability (asset)      
Beginning balance 6,548    
Ending balance 7,740 6,548  
Reimbursement rights recognised in long-term receivables 217 305  
Gain (loss) recognised in other comprehensive income (83) (1)  
Pension | Benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 58,305 56,282  
Movements recognised in the income statement: 6,371 6,274  
current service cost 1,496 1,414  
curtailments and settlements (11)    
interest cost 4,886 4,860  
Actuarial (gains) losses recognised in other comprehensive income: 1,360 (2,488)  
arising from changes in demographic assumptions (7) 20  
arising from changes in financial assumptions 1,233 (2,638)  
arising from change in actuarial experience 134 130  
Member contributions 482 447  
Benefits paid (2,760) (2,875)  
Transferred to held for sale assets   (30)  
Translation of foreign operations 48 695  
Ending balance 63,806 58,305 56,282
Pension | Benefit obligation | Unfunded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 7,915    
Ending balance 8,868 7,915  
Pension | Benefit obligation | Funded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 50,390    
Ending balance 54,938 50,390  
Pension | South Africa      
Disclosure of net defined benefit liability (asset)      
Beginning balance (582)    
Ending balance (555) (582)  
Pension | South Africa | Benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 47,285 46,508  
Movements recognised in the income statement: 5,694 5,678  
current service cost 1,042 1,028  
curtailments and settlements 3    
interest cost 4,649 4,650  
Actuarial (gains) losses recognised in other comprehensive income: 262 (2,950)  
arising from changes in financial assumptions 174 (2,950)  
arising from change in actuarial experience 88    
Member contributions 482 447  
Benefits paid (2,482) (2,398)  
Ending balance 51,241 47,285 46,508
Pension | South Africa | Benefit obligation | Funded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 47,285    
Ending balance 51,241 47,285  
Pension | Foreign Countries      
Disclosure of net defined benefit liability (asset)      
Beginning balance 7,130    
Ending balance 8,295 7,130  
Pension | Foreign Countries | Benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 11,020 9,774  
Movements recognised in the income statement: 677 596  
current service cost 454 386  
curtailments and settlements (14)    
interest cost 237 210  
Actuarial (gains) losses recognised in other comprehensive income: 1,098 462  
arising from changes in demographic assumptions (7) 20  
arising from changes in financial assumptions 1,059 312  
arising from change in actuarial experience 46 130  
Benefits paid (278) (477)  
Transferred to held for sale assets   (30)  
Translation of foreign operations 48 695  
Ending balance 12,565 11,020 R 9,774
Pension | Foreign Countries | Benefit obligation | Unfunded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 7,915    
Ending balance 8,868 7,915  
Pension | Foreign Countries | Benefit obligation | Funded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Beginning balance 3,105    
Ending balance R 3,697 R 3,105