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Segmental information - Reconciliation of underlying EBITDA to profit after taxation (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of operating segments [line items]    
Underlying EBITDA $ 15,597 $ 21,037
Taxation in subsidiaries and finance items in equity accounted units (2,902) (4,981)
Gains recognised by Kitimat relating to LNG Canada's project 116 0
Gains/(Losses) on embedded commodity derivatives not qualifying for hedge accounting (including foreign exchange) 14 (2)
Increase in closure estimates (non-operating and fully impaired sites) (43) (175)
Profit before taxation 12,315 18,049
Unconsolidated subsidiaries    
Disclosure of operating segments [line items]    
Depreciation and amortisation in subsidiaries and equity accounted units (242) (249)
Taxation in subsidiaries and finance items in equity accounted units (363) (365)
Subsidiaries    
Disclosure of operating segments [line items]    
Depreciation and amortisation in subsidiaries and equity accounted units (2,405) (2,253)
Finance items in subsidiaries (359) 56
Taxation in subsidiaries and finance items in equity accounted units $ (2,902) $ (4,981)