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Oil And Gas Properties - Summary of Oil And Gas Properties (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year $ 39,919  
At the end of the financial year 40,791 $ 39,919
Land and buildings [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 840  
At the end of the financial year 701 840
Transferred exploration and evaluation [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 481  
At the end of the financial year 777 481
Plant and equipment [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 23,057  
At the end of the financial year 23,589 23,057
Projects in development [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year [1] 15,541  
At the end of the financial year 15,724 15,541 [1]
Oil and gas assets [member]    
Disclosure of detailed information about oil and gas properties [line items]    
At the beginning of the financial year 39,919  
At the end of the financial year 40,791 39,919
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 39,919 18,649
Acquisitions through business combinations [2]   19,353
Additions 6,595 [3] 3,824
Disposals at written down value (10) (45)
Depreciation and amortisation (3,956) (2,798)
Completions and transfers 304 36
Impairment reversal [4]   900
Impairment losses [4] (1,440)  
Transfer to assets held for sale [5] (621)  
At the end of the financial year 40,791 39,919
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 64,513  
At the end of the financial year 70,439 64,513
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 (24,594)  
At the end of the financial year (29,648) (24,594)
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 840  
At the end of the financial year 701 840
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 840 739
Acquisitions through business combinations [2]   64
Disposals at written down value (8) (3)
Depreciation and amortisation (67) (54)
Completions and transfers   7
Impairment reversal [4]   87
Impairment losses [4] (64)  
At the end of the financial year 701 840
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 1,765  
At the end of the financial year 1,745 1,765
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 (925)  
At the end of the financial year (1,044) (925)
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 481  
At the end of the financial year 777 481
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 481 526
Disposals at written down value   (10)
Depreciation and amortisation (125) (107)
Completions and transfers 441 42
Impairment reversal [4]   30
Impairment losses [4] (20)  
At the end of the financial year 777 481
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 1,538  
At the end of the financial year 1,979 1,538
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 (1,057)  
At the end of the financial year (1,202) (1,057)
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 23,057  
At the end of the financial year 23,589 23,057
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 23,057 12,465
Acquisitions through business combinations [2]   11,952
Additions 836 [3] (508)
Disposals at written down value (2) (32)
Depreciation and amortisation (3,764) (2,637)
Completions and transfers 4,496 1,034
Impairment reversal [4]   783
Impairment losses [4] (1,028)  
Transfer to assets held for sale [5] (6)  
At the end of the financial year 23,589 23,057
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 45,273  
At the end of the financial year 50,272 45,273
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 (22,216)  
At the end of the financial year (26,683) (22,216)
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 15,541  
At the end of the financial year 15,724 15,541
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 15,541 4,919
Acquisitions through business combinations [2]   7,337
Additions 5,759 [3] 4,332
Completions and transfers (4,633) (1,047)
Impairment losses [4] (328)  
Transfer to assets held for sale [5] (615)  
At the end of the financial year 15,724 15,541
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 15,937  
At the end of the financial year 16,443 15,937
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 (396)  
At the end of the financial year $ (719) $ (396)
[1] Projects in development include the fair value ascribed to future phases of certain projects acquired through business combinations.
[2] Refer to Note B.5 for details of business combination. Projects in development include the fair value ascribed to future phases of certain projects acquired through business combinations.
[3] Includes $5,317 million of capital additions, $311 million of capitalised borrowing costs and $967 million following changes in restoration provision.
[4] Refer to Note B.4 for details on impairment losses and impairment reversals.
[5] Refer to Note B.8 for details of the sell-down of the Scarborough Joint Venture.