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Impairment of Exploration and Evaluation and Oil and Gas Properties - Summary of Impairment Loss Recognized or Reversed for Cash Generating Unit (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Goodwill   $ 3,995 $ 4,614 $ 0
Impairment reversal   1,917   10
Impairment reversal     900 $ 1,058
Oil And Gas Properties [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal $ 68      
Impairment reversal     900  
Oil And Gas Properties [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 reversal   1,383    
Oil And Gas Properties [member] | WDS Australia Segment [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Recoverable amount 159   3,456  
Oil And Gas Properties [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 reversal   466    
Oil And Gas Properties [member] | Land and buildings [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal 0      
Impairment reversal     87  
Oil And Gas Properties [member] | Land and buildings [member] | International [member] | WDS Shenzi [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   0    
Oil And Gas Properties [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 reversal   64    
Oil And Gas Properties [member] | Transferred exploration and evaluation [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal 0      
Impairment reversal     30  
Oil And Gas Properties [member] | Transferred exploration and evaluation [member] | International [member] | WDS Shenzi [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   0    
Oil And Gas Properties [member] | Transferred exploration and evaluation [member] | WDS Australia Segment [Member] | Wheatstone [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   20    
Oil And Gas Properties [member] | Plant and equipment [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal 68      
Impairment reversal     $ 783  
Oil And Gas Properties [member] | Plant and equipment [member] | International [member] | WDS Shenzi [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   589    
Oil And Gas Properties [member] | Plant and equipment [member] | WDS Australia Segment [Member] | Wheatstone [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   371    
Oil And Gas Properties [member] | Projects in development [member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal $ 0      
Oil And Gas Properties [member] | Projects in development [member] | International [member] | WDS Shenzi [Member]        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment reversal   317    
Oil And Gas Properties [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 reversal   $ 11