v3.26.1
Borrowings and derivative financial instrument - 2026 and 2029 Notes (Details)
R in Millions, $ in Millions
 12 Months Ended
Nov. 16, 2021
USD ($)
Dec. 31, 2025
ZAR (R)
Dec. 31, 2024
ZAR (R)
Dec. 31, 2023
ZAR (R)
Reconciliation Of Changes In Borrowings [Abstract]        
Balance at beginning of the year   R 41,687 R 36,618 R 22,728
Interest charge   1,793 1,946 1,192
Unwinding of amortised cost   640 688 359
Accrued interest paid   (2,086) (1,947) (1,175)
(Gain)/loss on foreign exchange differences   (4,020) 344 2,105
Balance at end of the year   43,257 41,687 36,618
Current portion of balance   (11,402) (552) (11,672)
Non-current portion of borrowings   31,855 41,135 24,946
US$675 million senior notes due 2026        
Disclosure of detailed information about borrowings [line items]        
Interest rate (as a percent) 4.00%      
Face amount of debt | $ $ 675      
Debt term 5 years      
US$525 million senior notes due 2029        
Disclosure of detailed information about borrowings [line items]        
Interest rate (as a percent) 4.50%      
Face amount of debt | $ $ 525      
Debt term 8 years      
2026 and 2029 Notes        
Reconciliation Of Changes In Borrowings [Abstract]        
Balance at beginning of the year   22,354 22,042 20,140
Interest charge   905 928 932
Unwinding of amortised cost   101 98 80
Accrued interest paid   (911) (932) (951)
(Gain)/loss on foreign exchange differences   (2,625) 218 1,841
Balance at end of the year   19,824 22,354 22,042
Current portion of balance   (11,241) (118) (116)
Non-current portion of borrowings   R 8,583 R 22,236 R 21,926