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Disposal of assets and other transactions (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Inventories $ 31 $ 21
Property, plant and equipment 370 3,587
Others 1  
Total 402 3,608
Finance debt 134 133
Provision for decommissioning costs 290 1,332
Total 424 $ 1,465
Refining Transportation And Marketing Segment [Member]    
IfrsStatementLineItems [Line Items]    
Inventories 31  
Property, plant and equipment 23  
Others 1  
Total 55  
Exploration And Production Segment [Member]    
IfrsStatementLineItems [Line Items]    
Property, plant and equipment 347  
Total 347  
Provision for decommissioning costs 290  
Total 290  
Corporate And Other Business [Member]    
IfrsStatementLineItems [Line Items]    
Finance debt 134  
Total $ 134