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Employment costs and provisions - Summary of provisions including post-retirement benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [Line Items]    
Provisions, beginning balance $ 1,558 $ 1,658
Adjustment on currency translation (83) 32
Charged/(credited) to profit:    
– increases to existing and new provisions 199 78
– unused amounts reversed (12) (26)
Utilised in year (133) (277)
Remeasurement (gains)/losses recognised in other comprehensive income (94) 102
Transfers and other movements 21 (9)
Provisions, ending balance 1,456 1,558
Balance sheet analysis:    
Current 359 361
Non-current 1,097 1,197
Total 1,456 1,558
Pensions and post-retirement healthcare    
Disclosure of other provisions [Line Items]    
Provisions, beginning balance 1,189  
Adjustment on currency translation (48)  
Charged/(credited) to profit:    
– increases to existing and new provisions 91  
– unused amounts reversed 0  
Utilised in year (75)  
Remeasurement (gains)/losses recognised in other comprehensive income (94)  
Transfers and other movements 0  
Provisions, ending balance 1,063 1,189
Balance sheet analysis:    
Current 68  
Non-current 995  
Total 1,063 1,189
Other employee entitlements    
Disclosure of other provisions [Line Items]    
Provisions, beginning balance 369  
Adjustment on currency translation (35)  
Charged/(credited) to profit:    
– increases to existing and new provisions 108  
– unused amounts reversed (12)  
Utilised in year (58)  
Remeasurement (gains)/losses recognised in other comprehensive income 0  
Transfers and other movements 21  
Provisions, ending balance 393 369
Balance sheet analysis:    
Current 291  
Non-current 102  
Total 393 369
Provision for long service leave 313 296
Provision for redundancy and severance payments $ 24 $ 17