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Oil And Gas Properties - Summary of Oil And Gas Properties (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year $ 40,791  
At the end of the financial year 40,125 $ 40,791
Oil and gas assets [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 40,791  
At the end of the financial year 40,125 40,791
Oil and gas assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 40,791 39,919
Additions 2,320 [1] 6,595
Disposals at written down value (49) (10)
Depreciation and amortisation (1,893) (3,956)
Completions and transfers 26 [2] 304
Impairment losses   (1,440)
Transfer to assets held for sale (1,070) [3] (621)
At the end of the financial year 40,125 40,791
Oil and gas assets [member] | Historical Cost [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 70,439  
At the end of the financial year 71,668 70,439
Oil and gas assets [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year (29,648)  
At the end of the financial year (31,543) (29,648)
Oil and gas assets [member] | Land and buildings [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 701  
At the end of the financial year 671 701
Oil and gas assets [member] | Land and buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 701 840
Disposals at written down value (2) (8)
Depreciation and amortisation (28) (67)
Completions and transfers [2] 0  
Impairment losses   (64)
At the end of the financial year 671 701
Oil and gas assets [member] | Land and buildings [member] | Historical Cost [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 1,745  
At the end of the financial year 1,743 1,745
Oil and gas assets [member] | Land and buildings [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year (1,044)  
At the end of the financial year (1,072) (1,044)
Oil and gas assets [member] | Transferred exploration and evaluation [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 777  
At the end of the financial year 1,032 777
Oil and gas assets [member] | Transferred exploration and evaluation [member] | Gross carrying amount [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 777 481
Disposals at written down value   0
Depreciation and amortisation (86) (125)
Completions and transfers 341 [2] 441
Impairment losses   (20)
At the end of the financial year 1,032 777
Oil and gas assets [member] | Transferred exploration and evaluation [member] | Historical Cost [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 1,979  
At the end of the financial year 2,320 1,979
Oil and gas assets [member] | Transferred exploration and evaluation [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year (1,202)  
At the end of the financial year (1,288) (1,202)
Oil and gas assets [member] | Plant and equipment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 23,589  
At the end of the financial year 27,070 23,589
Oil and gas assets [member] | Plant and equipment [member] | Gross carrying amount [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 23,589 23,057
Additions (127) [1] 836
Disposals at written down value 0 (2)
Depreciation and amortisation (1,779) (3,764)
Completions and transfers 5,391 [2] 4,496
Impairment losses   (1,028)
Transfer to assets held for sale (4) [3] (6)
At the end of the financial year 27,070 23,589
Oil and gas assets [member] | Plant and equipment [member] | Historical Cost [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 50,272  
At the end of the financial year 55,533 50,272
Oil and gas assets [member] | Plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year (26,683)  
At the end of the financial year (28,463) (26,683)
Oil and gas assets [member] | Projects in development [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year [4] 15,724  
At the end of the financial year [4] 11,352 15,724
Oil and gas assets [member] | Projects in development [member] | Gross carrying amount [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year [4] 15,724 15,541
Additions [4] 2,447 [1] 5,759
Disposals at written down value [4] (47)  
Completions and transfers [4] (5,706) [2] (4,633)
Impairment losses [4]   (328)
Transfer to assets held for sale [4] (1,066) [3] (615)
At the end of the financial year [4] 11,352 15,724
Oil and gas assets [member] | Projects in development [member] | Historical Cost [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year [4] 16,443  
At the end of the financial year [4] 12,072 16,443
Oil and gas assets [member] | Projects in development [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year [4] (719)  
At the end of the financial year [4] $ (720) $ (719)
[1] Includes $2,212 million of capital additions and $187 million of capitalised borrowing costs offset by $79 million relating to changes in restoration provision assumptions. The $127 million of additions reducing plant and equipment relates to changes in restoration provision assumptions.
[2] Upon first oil in June 2024, the carrying value of the Sangomar project in projects in development has been transferred to plant and equipment.
[3] Refer to Note B.4 for details of the sell-downs of the Scarborough Joint Venture.
[4] Projects in development include the fair value ascribed to future phases of certain projects acquired through business combinations.