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Post-retirement benefit obligations - Sensitivity analysis (Details) - Pension - ZAR (R)
R in Millions
Jun. 30, 2022
Jun. 30, 2021
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 6 R 9
Increase (decrease) in net obligation due to decrease in actuarial assumption R (6) R (8)
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 (1,161) R (1,474)
Increase (decrease) in net obligation due to decrease in actuarial assumption R 1,364 R 1,748
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 1,453 R 1,821
Increase (decrease) in net obligation due to decrease in actuarial assumption R (1,261) R (1,566)
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 312 R 470
Increase (decrease) in net obligation due to decrease in actuarial assumption R (271) R (446)
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 (1,199) R (1,833)
Increase (decrease) in net obligation due to decrease in actuarial assumption R 1,507 R 2,360
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 929 R 1,353
Increase (decrease) in net obligation due to decrease in actuarial assumption R (737) R (1,102)