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Provisions - Summary of Changes in Group's Provisions (Parenthetical) (Detail) - Hydrocarbon Wells Abandonmnet Cost [member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of provisions [line items]      
Abandonment of hydrocarbon wells cost $ 268 $ 32 $ (166)
Dispute relating to the tax deduction of hydrocarbon well abandonment costs for periods 2014-2017      
Disclosure of provisions [line items]      
Recovery of Liabilities of Dispute relating to tax Deduction 30    
Other contingent liabilities [member] | Dispute relating to the tax deduction of hydrocarbon well abandonment costs for periods 2014-2017 | Administracion Federal De Ingresos Publicos [member]      
Disclosure of provisions [line items]      
Increase decrease through transfers and other changes other provisions $ 22    
Extended Moratorium [Member]      
Disclosure of provisions [line items]      
Tax claims reclassified to tax charges     37
Recovery of Liabilities of Dispute relating to tax Deduction     $ 45