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Post-retirement benefit obligations - Reconciliation Plan Assets, RF, Contributions (Details) - Pension
R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2019
ZAR (R)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
ZAR (R)
Disclosure of net defined benefit liability (asset)      
Beginning balance R (6,548)    
Ending balance (7,740)   R (6,548)
Plan assets      
Disclosure of net defined benefit liability (asset)      
Beginning balance 54,018   50,854
Movements recognised in the income statement: 4,815   4,774
interest expense (income) 5,040   4,896
interest on asset limitation (225)   (122)
Actuarial gains (losses) recognised in other comprehensive income: 514   (1,779)
Return on plan assets 514   (1,779)
Member contributions 482   447
Employer contribution 1,062   2,224
Benefits paid (2,603)   (2,712)
Translation of foreign operations 97   210
Ending balance 58,385   54,018
Actual return on plan assets 5,329   2,995
South Africa      
Disclosure of net defined benefit liability (asset)      
Beginning balance 582    
Ending balance 555   582
South Africa | Funded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Projected pension contributions for next fiscal year 1,106    
South Africa | Plan assets      
Disclosure of net defined benefit liability (asset)      
Beginning balance 50,128   48,340
Movements recognised in the income statement: 4,702   4,707
interest expense (income) 4,927   4,829
interest on asset limitation (225)   (122)
Actuarial gains (losses) recognised in other comprehensive income: 229   (1,959)
Return on plan assets 229   (1,959)
Member contributions 482   447
Employer contribution 1,056   991
Benefits paid (2,482)   (2,398)
Ending balance 54,115   50,128
Actual return on plan assets 4,931   2,748
Foreign Countries      
Disclosure of net defined benefit liability (asset)      
Beginning balance (7,130)    
Ending balance (8,295)   (7,130)
Foreign Countries | Funded benefit obligation      
Disclosure of net defined benefit liability (asset)      
Projected pension contributions for next fiscal year 120    
Foreign Countries | Plan assets      
Disclosure of net defined benefit liability (asset)      
Beginning balance 3,890   2,514
Movements recognised in the income statement: 113   67
interest expense (income) 113   67
Actuarial gains (losses) recognised in other comprehensive income: 285   180
Return on plan assets 285   180
Employer contribution 6   1,233
Benefits paid (121)   (314)
Translation of foreign operations 97   210
Ending balance 4,270   3,890
Actual return on plan assets R 398   247
United States of America | Plan assets      
Disclosure of net defined benefit liability (asset)      
Once-off payment made by the employer to the fund   $ 75 R 963