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Disposal of assets and other transactions (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Assets classified as held for sale    
Property, plant and equipment $ 510 $ 335
Total 510 335
Liabilities on assets classified as held for sale    
Finance debt 99
Provision for decommissioning costs 713 442
Total 713 $ 541
Exploration And Production Segment [Member]    
Assets classified as held for sale    
Property, plant and equipment 510  
Total 510  
Liabilities on assets classified as held for sale    
Provision for decommissioning costs 713  
Total $ 713