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Exploration And Evaluation - Summary of Exploration And Evaluation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about exploration and evaluation [line items]    
Exploration commitments $ 7,762 $ 7,875
Exploration and evaluation assets [member] | Asia Pacific [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Exploration commitments 1 16 [1]
Exploration and evaluation assets [member] | Asia Pacific [Member] | Carrying Amounts [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance [1] 546 1,981
Additions 19 494 [1]
Expensed [1],[2]   (265)
Transferred exploration and evaluation (36) (1,664) [1]
Carrying amount, Ending balance 529 546 [1]
Exploration and evaluation assets [member] | Americas [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Exploration commitments 1 1 [1]
Exploration and evaluation assets [member] | Americas [Member] | Carrying Amounts [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Acquisitions through business combination [3] 180  
Additions 204  
Disposals (10)  
Amortisation of licence acquisition costs (8)  
Expensed [2] (126)  
Carrying amount, Ending balance 240  
Exploration and evaluation assets [member] | Africa [Member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Exploration commitments 27 77 [1]
Exploration and evaluation assets [member] | Africa [Member] | Carrying Amounts [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance [1] 68 64
Additions 17 7 [1]
Amortisation of licence acquisition costs (2) (3) [1]
Expensed [2] (45)  
Carrying amount, Ending balance 38 68 [1]
Exploration and evaluation assets [member] | Other [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Exploration commitments 29 94 [1]
Exploration and evaluation assets [member] | Other [member] | Carrying Amounts [member]    
Disclosure of detailed information about exploration and evaluation [line items]    
Carrying amount, Beginning balance [1] 614 2,045
Acquisitions through business combination [3] 180  
Additions 240 501 [1]
Disposals (10)  
Amortisation of licence acquisition costs (10) (3) [1]
Expensed [2] (171) (265) [1]
Transferred exploration and evaluation (36) (1,664) [1]
Carrying amount, Ending balance $ 807 $ 614 [1]
[1] Oceania and Asia have been presented within Asia Pacific for the year ended 31 December 2022. The 2021 amounts have been reclassified to be presented on the same basis.
[2] $125 million (2021: $56 million) relates to costs of unsuccessful wells. For the year ended 31 December 2021, $209 million relates to capitalised costs written off due to the Group’s decision to withdraw its interests in Myanmar.
[3] Acquisitions through business combination have been recognised on a provisional basis. Adjustments will be made to the provisional amounts if new information is obtained within 12 months from the acquisition date. Refer to Note B.5 for details.