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Goodwill - Summary of goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period $ 826 [1] $ 879
Adjustment on currency translation (29) (53)
Goodwill at end of period 797 826 [1]
Richards Bay Minerals    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 405  
Goodwill at end of period 370 405
Pilbara    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 337  
Goodwill at end of period 342 337
Dampier Salt    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 84  
Goodwill at end of period 85 84
Cost    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period 15,974 16,987
Goodwill at end of period 16,237 15,974
Accumulated impairment    
Disclosure of reconciliation of changes in goodwill [Line Items]    
Goodwill at beginning of period (15,148) (16,108)
Goodwill at end of period $ (15,440) $ (15,148)
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.