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Goodwill - Key assumptions calculation of fair value less costs of disposal (Detail) - Richards Bay Minerals - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]    
Fair value less costs of disposal, post-tax discount rate 8.60% 8.60%
Five Percentage Increase In The Titanium Slag Price    
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]    
Corresponding increase (decrease) in FVLCD $ 144 $ 217
One Percentage Increase In The Discount Rate Applied To Posttax Cash Flows    
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]    
Fair value less costs of disposal, post-tax discount rate 1.00%  
Corresponding increase (decrease) in FVLCD $ (135) (175)
Ten Percentage Strengthening Of South African Rand    
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]    
Strengthening percentage of the South African rand 10.00%  
Corresponding increase (decrease) in FVLCD $ 232 $ 272
Titanium | Five Percentage Increase In The Titanium Slag Price    
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]    
Percentage of increase in the titanium slag price 5.00%