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Segment Revenue and Expenses - Summary of Earnings (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 01, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]        
Revenue from sale of liquified natural gas   $ 16,817 $ 6,962 $ 3,600
Impairment loss     10 5,269
Gains (losses) on change in fair value of derivatives   960 31 31
BHP Petroleum International Pty Ltd [member]        
Disclosure of operating segments [line items]        
Acquisition related costs paid classified as operating activities $ 419 357    
Operating segments [member]        
Disclosure of operating segments [line items]        
Revenue from contracts with customers   16,790 6,923  
Sub-lease income   27 39  
Movement in onerous contract provision, Changes in estimates   245 95 54
Movement in onerous contract provision, Provision used   29 45 41
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  
Revenue from sale of liquified natural gas   16,817 6,962 3,600
Onerous contract provision       447
Movement in onerous contract provision, Revision of discount rates       5
Impairment loss     (10) (5,269)
Revaluation gain on assets   427    
Variable consideraion   71    
Operating segments [member] | Exploration and evaluation assets [member]        
Disclosure of operating segments [line items]        
Impairment loss       1,557
Operating segments [member] | Oil and gas assets [member]        
Disclosure of operating segments [line items]        
Impairment loss       3,712
Operating segments [member] | Australia segment [member]        
Disclosure of operating segments [line items]        
Revenue from sale of liquified natural gas   12,299 5,240 3,421
Impairment loss     $ (10) (3,971)
Operating segments [member] | Adjustment [member] | Australia segment [member]        
Disclosure of operating segments [line items]        
Revenue from sale of liquified natural gas       $ 113
Corporates Or Others 2022        
Disclosure of operating segments [line items]        
Costs of unsuccessful wells   $ 125