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Post-retirement benefit obligations - Investments Target Allocation (Details)
Jun. 30, 2023
age
item
Pension benefits  
Number of investment portfolios members can choose from | item 4
Plan assets at fair value - Low risk portfolio, Percent 0.40%
Plan assets at fair value - Moderate balanced portfolio, Percent 96.80%
Plan assets at fair value - Aggressive balanced portfolio, Percent 1.90%
Plan assets at fair value - Money market portfolio, Percent 0.90%
Minimum  
Pension benefits  
Age of participant for money market portfolio | age 55
South Africa | Pension | Minimum  
Pension benefits  
Target allocation, equity- local (as a percent) 25.00%
Target allocation, equity- foreign (as a percent) 25.00%
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%
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 of America | 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%