v3.25.2
Financial risk management activities - Fair value of financial instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset $ 79 $ 48 $ 48
Borrowings 2,103 1,984 $ 2,239
Level 3      
Disclosure of detailed information about financial instruments [line items]      
Joint venture loan receivable 402 463  
Deferred consideration asset 103 0  
Level 3 | Borrowings - Revolving Credit Facilities      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 360 243  
Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Joint venture loan receivable 402 463  
Deferred consideration asset 103 0  
Level 3 | Fair value | Borrowings - Revolving Credit Facilities      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 360 243  
Level 1 | Borrowings - Rated bonds      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 1,743 1,741  
Level 1 | Listed equity investments      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through other comprehensive income 85 53  
Level 1 | Fair value | Borrowings - Rated bonds      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 1,685 1,631  
Level 1 | Fair value | Listed equity investments      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through other comprehensive income 85 53  
Mponeng      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 19    
Mponeng | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 19 23  
Mponeng | Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 19 23  
Gramalote      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 26    
Gramalote | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 26 25  
Gramalote | Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 26 25  
Mansala | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 21 0  
Mansala | Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 21 0  
Doropo and ABC | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset 13 0  
Doropo and ABC | Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration asset $ 13 $ 0