v3.26.1
Financial risk management activities - Fair value of financial instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset $ 112 $ 122   $ 48
Borrowings 1,571 2,044   $ 1,984
Level 3        
Disclosure of detailed information about financial instruments [line items]        
Joint venture loan receivable 233 333    
Deferred consideration asset 116 110    
Level 3 | Borrowings - Revolving Credit Facilities        
Disclosure of detailed information about financial instruments [line items]        
Borrowings 489 299    
Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Joint venture loan receivable 233 333    
Deferred consideration asset 116 110    
Level 3 | Fair value | Borrowings - Revolving Credit Facilities        
Disclosure of detailed information about financial instruments [line items]        
Borrowings 489 299    
Level 1 | Borrowings - Rated bonds        
Disclosure of detailed information about financial instruments [line items]        
Borrowings 1,082 1,745    
Level 1 | Listed equity investments        
Disclosure of detailed information about financial instruments [line items]        
Financial assets at fair value through other comprehensive income 89 11    
Level 1 | Fair value | Borrowings - Rated bonds        
Disclosure of detailed information about financial instruments [line items]        
Borrowings 1,068 1,729    
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 89 11    
Mponeng        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 5   $ 23  
Mponeng | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 5 23    
Mponeng | Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 5 23    
Gramalote        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 18   18  
Gramalote | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 18 18    
Gramalote | Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 18 18    
Mansala        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 23   23  
Mansala | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 24 23    
Mansala | Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 24 23    
Doropo and ABC | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 17 14    
Doropo and ABC | Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 17 14    
Mineraçao Serra Grande Mine (MSG)        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 48   $ 44  
Mineraçao Serra Grande Mine (MSG) | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset 48 44    
Mineraçao Serra Grande Mine (MSG) | Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Contingent consideration asset $ 48 $ 44