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Intangible Assets - Summary of changes in intangible assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance $ 4,183 [1] $ 4,670
Acquisitions through business combinations 941  
Adjustment to BHPP merger purchase price allocation   55
Additions 40 134
Amortisation (40) (2)
Impairment losses   (477)
Goodwill disposed (298)  
Transfer to assets held for sale   (197)
Carrying amount ending balance [1] 4,826 4,183
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 4,662  
Carrying amount ending balance 5,345 4,662
Accumulated impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance (479)  
Carrying amount ending balance (519) (479)
Contract assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 15 1
Acquisitions through business combinations 766  
Adjustment to BHPP merger purchase price allocation   0
Additions 1 16
Amortisation (25) (2)
Impairment losses   0
Transfer to assets held for sale   0
Carrying amount ending balance 757 15
Contract assets [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 17  
Carrying amount ending balance 784 17
Contract assets [member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance (2)  
Carrying amount ending balance (27) (2)
Computer software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 173 55
Acquisitions through business combinations 6  
Adjustment to BHPP merger purchase price allocation   0
Additions 39 118
Amortisation (15) 0
Impairment losses   0
Transfer to assets held for sale   0
Carrying amount ending balance 203 173
Computer software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 173  
Carrying amount ending balance 218 173
Computer software [member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 0  
Carrying amount ending balance (15) 0
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 3,995 4,614
Acquisitions through business combinations 169  
Adjustment to BHPP merger purchase price allocation   55
Additions 0 0
Impairment losses   (477)
Goodwill disposed (298)  
Transfer to assets held for sale   (197)
Carrying amount ending balance 3,866 3,995
Goodwill [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance 4,472  
Carrying amount ending balance 4,343 4,472
Goodwill [member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Carrying amount beginning balance (477)  
Carrying amount ending balance $ (477) $ (477)
[1] Intangible assets include software and contract assets which were previously presented within other assets (non-current). The 2023 amounts have been reclassified to be presented on the same basis (refer to Note B.6).