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Taxes - Additional Information (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Disclosure Of Components Of Income Tax Expense [Line Items]          
Taxable Profit Percentage   10      
Deferred tax expense income recognized in the income statement   $ (916) $ (702) $ 118  
Recognised Deferred tax assets   $ 2,393 $ 1,717    
Long term bond rate   3.20% 3.20%    
North West Shelf Project [member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Deductible temporary differences for which no deferred tax asset is recognised   $ 7,490 $ 7,428    
Temporary Difference Pluto Quarantined Exploration Expenditure [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Deductible temporary differences for which no deferred tax asset is recognised   601 872    
Unused tax losses and credits [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Recognised Deferred tax assets   410 333    
Temporary Difference Wheatstone [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Deductible temporary differences for which no deferred tax asset is recognised   795 758    
Pluto PRRT Deferred Tax Asset [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Increase decrease in the deferred tax asset after tax   351      
Increase (decrease) in deferred tax asset   502      
Pluto And Wheatstone [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Tax payments from new legislation   163      
Current tax payable   27      
Sangomar Project [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Deferred tax expense income recognized in the income statement $ 342        
Trion [member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Deferred tax expense income recognized in the income statement   $ 319      
Bottom of range [member] | Pillar Two Legislation [member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Applicable tax rate   15.00%      
Top of range [member] | Pillar Two Legislation [member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Applicable tax rate         15.00%
USA Tax Consolidation Group [Member] | Unused tax losses and credits [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Unused tax losses for which no deferred tax asset recognised   $ 366 232    
Recognised Deferred tax assets   1,274 1,248    
Other Than Australia And The USA [Member] | Unused tax losses and credits [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Unused tax losses for which no deferred tax asset recognised   715 763    
Medium Term Notes [member] | Unused tax losses and credits [Member]          
Disclosure Of Components Of Income Tax Expense [Line Items]          
Unused tax losses for which no deferred tax asset recognised   $ 343 $ 189