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Taxes - Summary of Reconciliation of Deferred Tax Balance Sheet (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets $ 1,717 $ 1,959
Deferred tax liabilities 1,627 2,457
PRRT [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,101 1,821
Deferred tax liabilities 389 613
PRRT [member] | Production and growth assets [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 455 1,460
Deferred tax liabilities 1,309 1,281
PRRT [member] | Augmentation for current year [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 231 113
Deferred tax liabilities (38) (62)
PRRT [member] | Provisions [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 445 271
Deferred tax liabilities (995) (743)
PRRT [member] | Other [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets (30) (23)
Deferred tax liabilities 113 137
Income Tax [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,717 1,959
Deferred tax liabilities 1,627 2,457
Income Tax [member] | Provisions [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 227 60
Deferred tax liabilities (1,856) (1,280)
Income Tax [member] | Other [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets (9) 34
Deferred tax liabilities (76) (89)
Income Tax [member] | Oil and gas properties [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets (1,388) (1,496)
Deferred tax liabilities 2,939 2,857
Income Tax [member] | Exploration and evaluation assets [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 60 30
Deferred tax liabilities 127 67
Income Tax [member] | Lease assets and liabilities [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 40 23
Deferred tax liabilities (48) (22)
Income Tax [member] | PRRT assets and liabilities [Member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax liabilities 118 347
Income Tax [member] | Unused tax losses and tax credits [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 1,686 1,464
Income Tax [member] | Assets held for sale [Member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax liabilities 36 0
Income Tax [member] | Derivatives [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 0 23
Deferred tax liabilities (2) (36)
Income Tax [member] | Income tax deferred tax [member]    
Disclosure Of Reconciliation Of Deferred Tax Balance Sheet [Line Items]    
Deferred tax assets 616 138
Deferred tax liabilities $ 1,238 $ 1,844