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Segmental information - Reconciliation of underlying EBITDA to profit before taxation (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure Of Reconciliation Of Underlying EBITDA To Profit Before Taxation [Abstract]    
Underlying EBITDA $ 21,037 $ 9,640
(Losses)/gains on embedded commodity derivatives not qualifying for hedge accounting (including exchange) (2) 53
Change in closure estimates (non-operating and fully impaired sites) (175) (172)
Depreciation and amortisation in subsidiaries and equity accounted units (2,502) (2,288)
Impairment charges 0 (1,163)
Taxation and finance items in equity accounted units (365) (141)
Finance items 56 (650)
Profit before taxation $ 18,049 $ 5,279