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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R)
R in Millions
Jun. 30, 2021
Jun. 30, 2020
South Africa | Salary increase    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R 9 R 9
Increase (decrease) in net obligation due to decrease in actuarial assumption R (8) R (9)
South Africa | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R (1,474) R (1,425)
Increase (decrease) in net obligation due to decrease in actuarial assumption R 1,748 R 3,237
South Africa | Pension increase    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R 1,821 R 3,309
Increase (decrease) in net obligation due to decrease in actuarial assumption R (1,566) R (1,491)
Foreign Countries | Salary increase    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R 470 R 676
Increase (decrease) in net obligation due to decrease in actuarial assumption R (446) R (479)
Foreign Countries | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R (1,833) R (2,269)
Increase (decrease) in net obligation due to decrease in actuarial assumption R 2,360 R 3,133
Foreign Countries | Pension increase    
Disclosure of sensitivity analysis for actuarial assumptions    
Increase in actuarial assumption (as a percent) 1.00% 1.00%
Decrease in actuarial assumption (as a percent) 1.00% 1.00%
Increase (decrease) in net obligation due to increase in actuarial assumption R 1,353 R 1,446
Increase (decrease) in net obligation due to decrease in actuarial assumption R (1,102) R (1,179)