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Goodwill - Summary of goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period $ 797 $ 826
Adjustment on currency translation (45) (29)
Company no longer consolidated (25) 0
Goodwill at end of period 727 797
Richards Bay Minerals    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 370  
Goodwill at end of period 364 370
Pilbara    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 342  
Goodwill at end of period 310 342
Dampier Salt    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 85  
Goodwill at end of period 53 85
- cost    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 16,237 15,974
Goodwill at end of period 14,959 16,237
- accumulated impairment    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period (15,440) (15,148)
Goodwill at end of period $ (14,232) $ (15,440)