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Post-retirement benefit obligations - Investments (Details) - Pension - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
South Africa        
Pension benefits        
Percentage of members electing to transfer to the defined contribution section of the pension fund 99.00%      
Ordinary shares included in the plan assets   2,082,248   2,079,248
Value of ordinary shares included in the plan assets   R 454   R 275
Value of property occupied included in the plan assets   R 1,521   R 1,555
Pension fund assets        
Equities 54.00%   47.00%  
Resources 7.00%   5.00%  
Industrials 2.00%   2.00%  
Consumer discretionary 11.00%   9.00%  
Consumer staples 9.00%   9.00%  
Healthcare 5.00%   5.00%  
Information technologies 6.00%   6.00%  
Telecommunications 4.00%   3.00%  
Financials (ex real estate) 10.00%   8.00%  
Fixed interest 16.00%   17.00%  
Direct property 11.00%   15.00%  
Listed property 2.00%   2.00%  
Cash and cash equivalents 4.00%   7.00%  
Third party managed assets 12.00%   12.00%  
Other 1.00%      
Total 100.00%   100.00%  
United States        
Pension fund assets        
Equities 30.00%   35.00%  
Resources 4.00%   5.00%  
Industrials 3.00%   4.00%  
Consumer discretionary 4.00%   4.00%  
Consumer staples 2.00%   2.00%  
Healthcare 4.00%   5.00%  
Information technologies 6.00%   7.00%  
Telecommunications 2.00%   3.00%  
Financials (ex real estate) 5.00%   5.00%  
Fixed interest 50.00%   49.00%  
Direct property 6.00%   6.00%  
Other 14.00%   10.00%  
Total 100.00%   100.00%