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Taxes - Summary of Reconciliation of Deferred Tax Balance Sheet (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets $ 1,959 $ 1,007
Deferred tax liabilities 2,457 878
Petroleum Resource Rent Tax [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,821 1,007
Deferred tax liabilities 613  
Petroleum Resource Rent Tax [member] | Production and growth assets [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,460 767
Deferred tax liabilities 1,281  
Petroleum Resource Rent Tax [member] | Augmentation for current year [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 113 166
Deferred tax liabilities (62)  
Petroleum Resource Rent Tax [member] | Provisions [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 271 75
Deferred tax liabilities (743)  
Petroleum Resource Rent Tax [member] | Other [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets (23) (1)
Deferred tax liabilities 137  
Income Tax [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,959 1,007
Deferred tax liabilities 2,457 878
Income Tax [member] | Provisions [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 60  
Deferred tax liabilities (1,280) (706)
Income Tax [member] | Other [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 34  
Deferred tax liabilities (89) (32)
Income Tax [member] | Oil and gas properties [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets (1,496)  
Deferred tax liabilities 2,857 1,520
Income Tax [member] | Exploration and evaluation assets [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 30  
Deferred tax liabilities 67 51
Income Tax [member] | Lease assets and liabilities [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 23  
Deferred tax liabilities (22) (38)
Income Tax [member] | PRRT assets and liabilities [Member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax liabilities 347 303
Income Tax [member] | Unused tax losses and tax credits [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,464  
Income Tax [member] | Assets held for sale [Member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax liabilities   (205)
Income Tax [member] | Derivatives [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 23  
Deferred tax liabilities (36) (15)
Income Tax [member] | Income tax deferred tax [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 138  
Deferred tax liabilities $ 1,844 $ 878