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Post-retirement benefit obligations - Reconciliation PBO, RF Contributions (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Gain (loss) recognised in other comprehensive income R (1) R (50) R 63
Pension      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 6,638    
Ending balance 6,548 6,638  
Reimbursement rights recognised in long-term receivables 305 268  
Gain (loss) recognised in other comprehensive income (1) 50  
Pension | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 56,282 56,329  
Movements recognised in the income statement: 6,274 5,864  
current service cost 1,414 1,297  
past service cost   21  
interest cost 4,860 4,546  
Actuarial (gains) losses recognised in other comprehensive income: (2,488) (2,734)  
arising from changes in demographic assumptions 20 (3)  
arising from changes in financial assumptions (2,638) (2,774)  
arising from change in actuarial experience 130 43  
Member contributions 447 411  
Benefits paid (2,875) (2,504)  
Transferred to assets held for sale (30)    
Translation of foreign operations 695 (1,084)  
Ending balance 58,305 56,282 56,329
Pension | Funded benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 49,421    
Ending balance 50,390 49,421  
Pension | Unfunded benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 6,861    
Ending balance 7,915 6,861  
Pension | South Africa      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (622)    
Ending balance (582) (622)  
Pension | South Africa | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 46,508 44,823  
Movements recognised in the income statement: 5,678 5,277  
current service cost 1,028 927  
interest cost 4,650 4,350  
Actuarial (gains) losses recognised in other comprehensive income: (2,950) (1,803)  
arising from changes in financial assumptions (2,950) (1,803)  
Member contributions 447 411  
Benefits paid (2,398) (2,200)  
Ending balance 47,285 46,508 44,823
Pension | South Africa | Funded benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 46,508    
Ending balance 47,285 46,508  
Pension | Foreign Countries      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 7,260    
Ending balance 7,130 7,260  
Pension | Foreign Countries | Benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 9,774 11,506  
Movements recognised in the income statement: 596 587  
current service cost 386 370  
past service cost   21  
interest cost 210 196  
Actuarial (gains) losses recognised in other comprehensive income: 462 (931)  
arising from changes in demographic assumptions 20 (3)  
arising from changes in financial assumptions 312 (971)  
arising from change in actuarial experience 130 43  
Benefits paid (477) (304)  
Transferred to assets held for sale (30)    
Translation of foreign operations 695 (1,084)  
Ending balance 11,020 9,774 R 11,506
Pension | Foreign Countries | Funded benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 2,913    
Ending balance 3,105 2,913  
Pension | Foreign Countries | Unfunded benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 6,861    
Ending balance R 7,915 R 6,861