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Post-retirement benefit obligations - Reconciliation, projected net pension liability (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of net defined benefit liability (asset)      
Pension asset R 591 R 467 R 1,274
Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 9,490 11,352  
Pension asset 591 467  
Benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 70,322 63,549 63,806
Benefit obligation | Funded benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 60,294 51,985  
Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 28,359 25,617  
Benefit obligation | Funded benefit obligation | Pension - Defined benefit option      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 31,935 26,368  
Benefit obligation | Unfunded benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 10,028 11,564  
Plan assets | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (64,403) (55,120) (58,385)
Plan assets | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (32,468) (27,522)  
Plan assets | Pension - Defined benefit option      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (31,935) (27,598)  
Asset ceiling | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 3,571 2,923  
Increase in asset limitation 648 604  
South Africa | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (46) (467)  
Pension asset 46 467  
South Africa | Benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 57,054 47,228 51,241
South Africa | Benefit obligation | Funded benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 57,054 47,228  
South Africa | Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 25,119 20,860  
South Africa | Benefit obligation | Funded benefit obligation | Pension - Defined benefit option      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 31,935 26,368  
South Africa | Plan assets | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (60,671) (50,618) (54,115)
South Africa | Plan assets | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (28,736) (23,020)  
South Africa | Plan assets | Pension - Defined benefit option      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (31,935) (27,598)  
South Africa | Asset ceiling | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 3,571 2,923  
Foreign Countries | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 9,536 11,819  
Pension asset 545    
Foreign Countries | Benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 13,268 16,321 12,565
Foreign Countries | Benefit obligation | Funded benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 3,240 4,757  
Foreign Countries | Benefit obligation | Funded benefit obligation | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 3,240 4,757  
Foreign Countries | Benefit obligation | Unfunded benefit obligation | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total 10,028 11,564  
Foreign Countries | Plan assets | Pension      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total (3,732) (4,502) R (4,270)
Foreign Countries | Plan assets | Pension - Defined benefit portion      
Disclosure of net defined benefit liability (asset)      
Net pension obligations, Total R (3,732) R (4,502)