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Post-retirement benefit obligations - Investments Target Allocation (Details)
R in Millions
12 Months Ended
Jun. 30, 2022
ZAR (R)
item
age
Jun. 30, 2021
Pension benefits    
Number of investment portfolios members can choose from | item 4  
Plan assets at fair value - Low risk portfolio R 216  
Plan assets at fair value - Moderate balanced portfolio 64,656  
Plan assets at fair value - Aggressive balanced portfolio 1,269  
Plan assets at fair value - Money market portfolio R 919  
Minimum    
Pension benefits    
Age of participant for money market portfolio | age 55  
South Africa | Pension    
Pension benefits    
Increase in midpoint target allocation, equity- foreign (percentage points) 7.50%  
South Africa | Pension | Minimum    
Pension benefits    
Target allocation, equity- local (as a percent) 25.00%  
Target allocation, equity- foreign (as a percent) 25.00% 15.00%
Target allocation, Fixed Interest (as a percent) 10.00%  
Target allocation, Property (as a percent) 10.00%  
South Africa | Pension | Maximum    
Pension benefits    
Target allocation, equity- local (as a percent) 35.00%  
Target allocation, equity- foreign (as a percent) 35.00% 30.00%
Target allocation, Fixed Interest (as a percent) 25.00%  
Target allocation, Property (as a percent) 20.00%  
Target allocation, Other (as a percent) 15.00%  
United States | Pension | Maximum    
Pension benefits    
Target allocation, equity- local (as a percent) 100.00%  
Target allocation, equity- foreign (as a percent) 100.00%  
Target allocation, Fixed Interest (as a percent) 100.00%  
Target allocation, Property (as a percent) 100.00%  
Target allocation, Other (as a percent) 100.00%