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Exploration And Evaluation - Summary of Exploration And Evaluation (Detail) - Exploration and evaluation assets [member] - Carrying Amounts [member] - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Asia Pacific [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance $ 568 $ 529
Additions 11 79
Expensed   (31)
Transferred exploration and evaluation (8) (9) [1]
Carrying amount, Ending balance 571 568
Americas [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance 76 240
Additions 52 161
Amortisation of licence acquisition costs (5) (2)
Expensed   (28)
Transferred exploration and evaluation 0 (295) [1]
Carrying amount, Ending balance 123 76
Africa [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance 24 38
Additions 14 6
Amortisation of licence acquisition costs 0 (2)
Expensed   (18)
Transferred exploration and evaluation (18)  
Carrying amount, Ending balance 20 24
Other [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance 668 807
Additions 77 246
Amortisation of licence acquisition costs (5) (4)
Expensed   (77)
Transferred exploration and evaluation (26) (304) [1]
Carrying amount, Ending balance $ 714 $ 668
[1] On 20 June 2023, the Group made a final investment decision to develop the Trion resource in Mexico. Related exploration and evaluation assets of $274 million were transferred to oil and gas properties.