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Close-down, restoration and environmental provisions - Summary of provisions, including post-retirement benefits (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
Dec. 31, 2023
USD ($)
Jun. 30, 2023
Charged/(credited) to profit:          
Acquisition - newly consolidated operation $ 280 $ 61      
Close down restoration and environmental          
Disclosure of other provisions [Line Items]          
Opening balance 15,731 17,150      
Adjustment on currency translation 636 (1,128)      
Adjustments to mining properties/right of use assets:          
– changes to existing and new provisions (59) 851      
– change in discount rate 0 (787)      
Charged/(credited) to profit:          
– increases to existing and new provisions 38 435      
– change in discount rate 0 (235)      
– decreases and unused amounts reversed (9) (88)      
– exchange (gains)/losses on provisions (45) 26      
– amortisation of discount 378 843      
Utilised in the period (422) (1,142)      
Transfers and other movements 2 (255)      
Closing balance 16,530 15,731      
Balance sheet analysis:          
Current 1,252 1,183      
Non-current 15,278 14,548      
Total 16,530 15,731   $ 17,150  
Closure related receivables $ 375 $ 350      
Closure discount rate     0.025 0.020 0.020