v3.26.1
Borrowings and derivative financial instrument - Fair Value (Details) - ZAR (R)
R in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Burnstone Debt      
Disclosure of fair value measurement of liabilities [line items]      
Discount rate 8.69% 9.55% 10.74%
Level 1      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities R 42,370 R 29,061 R 18,949
Level 1 | 2026 and 2029 Notes      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 19,367 20,327 18,949
Level 1 | Burnstone Debt      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 0
Level 1 | US$ Convertible bond      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 23,003 8,734 0
Level 2      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 7,471
Level 2 | 2026 and 2029 Notes      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 0
Level 2 | Burnstone Debt      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 0
Level 2 | US$ Convertible bond      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 7,471
Level 2 | US$ Convertible bond | Amortised cost      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 7,990 8,231  
Level 3      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 4,395 2,235 2,509
Level 3 | 2026 and 2029 Notes      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 0
Level 3 | Burnstone Debt      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 4,395 2,235 2,509
Level 3 | US$ Convertible bond      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 0 0 0
Carrying value      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 31,120 32,535 32,571
Carrying value | 2026 and 2029 Notes      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 19,824 22,354 22,042
Carrying value | Burnstone Debt      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities 4,005 2,260 2,991
Carrying value | US$ Convertible bond      
Disclosure of fair value measurement of liabilities [line items]      
Liabilities R 7,291 R 7,921 R 7,538