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Impairment Of Exploration And Evaluation, Property, Plant And Equipment And Goodwill - Summary of Impairment Loss Recognized or Reversed for Cash Generating Unit (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Goodwill $ 3,866 $ 3,995
Property, plant and equipment [member] | WDS Australia Segment [Member] | Pyrenees [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount 159  
Goodwill 0  
Impairment loss 68  
Property, plant and equipment [member] | WDS Australia Segment [Member] | Wheatstone [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount 2,418  
Goodwill 0  
Impairment loss 466  
Property, plant and equipment [member] | International [member] | WDS Shenzi [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Recoverable amount 1,862  
Goodwill 477  
Impairment loss 1,383  
Property, plant and equipment [member] | Land and buildings [member] | WDS Australia Segment [Member] | Pyrenees [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Property, plant and equipment [member] | Land and buildings [member] | WDS Australia Segment [Member] | Wheatstone [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 64  
Property, plant and equipment [member] | Land and buildings [member] | International [member] | WDS Shenzi [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Property, plant and equipment [member] | Oil and gas properties [member] | WDS Australia Segment [Member] | Pyrenees [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 68  
Property, plant and equipment [member] | Oil and gas properties [member] | WDS Australia Segment [Member] | Wheatstone [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 391  
Property, plant and equipment [member] | Oil and gas properties [member] | International [member] | WDS Shenzi [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 589  
Property, plant and equipment [member] | Projects in development [member] | WDS Australia Segment [Member] | Pyrenees [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Property, plant and equipment [member] | Projects in development [member] | WDS Australia Segment [Member] | Wheatstone [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 11  
Property, plant and equipment [member] | Projects in development [member] | International [member] | WDS Shenzi [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 317  
Property, plant and equipment [member] | Other property, plant and equipment [member] | WDS Australia Segment [Member] | Pyrenees [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Property, plant and equipment [member] | Other property, plant and equipment [member] | WDS Australia Segment [Member] | Wheatstone [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Property, plant and equipment [member] | Other property, plant and equipment [member] | International [member] | WDS Shenzi [Member]    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss $ 0