v3.26.1
Borrowings and derivative financial instrument - US$1 billion RCF (Details)
R in Millions, $ in Millions
 12 Months Ended
Apr. 06, 2023
USD ($)
extension_option
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
Loans raised   7,912 8,278 14,431
Loans repaid   (4,883) (3,335) (1,323)
Accrued interest   1,793 1,946 1,192
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 balance   31,855 41,135 24,946
U S600 Million Revolving Credit Facility [Member]        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt | $ $ 600      
US$1 billion RCF        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt | $ $ 1,000      
Term of facility 3 years      
Number of one-year extensions | extension_option 2      
Borrowings, term of extension 1 year      
Reconciliation Of Changes In Borrowings [Abstract]        
Balance at beginning of the year   0 0 0
Loans raised   0 0 0
Loans repaid   0 0 0
Accrued interest   233 185 73
Accrued interest paid   (233) (185) (73)
(Gain)/loss on foreign exchange differences   0 0 0
Balance at end of the year   0 0 0
Current portion of balance   0 0 0
Non-current portion of balance   R 0 R 0 R 0
US$1 billion RCF | Minimum        
Disclosure of detailed information about borrowings [line items]        
Net debt to EBITDA threshold 1.0      
US$1 billion RCF | Median        
Disclosure of detailed information about borrowings [line items]        
Net debt to EBITDA threshold 2.0      
US$1 billion RCF | Maximum        
Disclosure of detailed information about borrowings [line items]        
Net debt to EBITDA threshold 3.0      
US$1 billion RCF | Net Debt to EBITDA less than threshold | Linked term SOFR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 1.60%      
US$1 billion RCF | Net debt to EBITDA between min threshold & midrange | Linked term SOFR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 1.80%      
US$1 billion RCF | Net debt To EBITDA between midrange & max threshold | Linked term SOFR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.00%      
US$1 billion RCF | Net Debt to EBITDA above threshold | Linked term SOFR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.20%