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Segment Revenue and Expenses - Summary of Earnings (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 01, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]        
Gains (losses) on hedging activities   $ (314) $ 35  
Gains (losses) on change in fair value of derivatives   352 349 $ 960
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   13,163 13,985 16,790
Sub-lease income   16 $ 9 27
Movement in onerous contract provision, Changes in estimates       245
Movement in onerous contract provision, Provision used       29
Revaluation gain on assets   $ 209   427
Costs relating to exit from exploration licences       142
Variable consideraion       $ 71