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Segment Revenue and Expenses - Summary of Earnings (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 01, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]        
Gains (losses) on change in fair value of derivatives   $ 349 $ 960 $ 31
BHP Petroleum International Pty Ltd [member]        
Disclosure of operating segments [line items]        
Acquisition related costs paid classified as operating activities $ 419      
Corporates Or Others 2022 [Member]        
Disclosure of operating segments [line items]        
Costs of unsuccessful wells     125  
Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from contracts with customers   13,985 16,790 6,923
Sub-lease income   $ 9 27 39
Movement in onerous contract provision, Changes in estimates     245 95
Movement in onerous contract provision, Provision used     29 45
Revaluation gain on assets     427  
Costs relating to exit from exploration licences     142  
Other trading income       67
Net foreign exchange gain       44
Costs of unsuccessful wells       56
Capitalised costs written off       209
Gain (loss) on hedge ineffectiveness       (91)
Exit fee       $ 33
Variable consideraion     $ 71