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Environmental rehabilitation obligation and other provisions - Key assumptions (Details) - Environmental rehabilitation obligation
R in Millions
12 Months Ended
Dec. 31, 2024
ZAR (R)
Discount rate  
Disclosure of other provisions [line items]  
Percentage of reasonably possible increase in unobservable input, liabilities 1.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 1.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities R 987
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities R 987
Inflation rate  
Disclosure of other provisions [line items]  
Percentage of reasonably possible increase in unobservable input, liabilities 1.00%
Percentage of reasonably possible decrease in unobservable input, liabilities 1.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities R 1,238
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities R 1,238
Discount period  
Disclosure of other provisions [line items]  
Reasonably possible period increase in unobservable input, liabilities 1 year
Reasonably possible period decrease in unobservable input, liabilities 1 year
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities R 311
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities R 311