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Taxation - Summary of prima facie tax reconciliation (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Major components of tax expense (income) [abstract]    
Profit before taxation $ 12,315 $ 18,049
Deduct: share of profit after tax of equity accounted units (468) (556)
Parent companies' and subsidiaries' profit before tax $ 11,847 $ 17,493
Applicable tax rate 19.00% 19.00%
Prima facie tax payable at UK rate of 19% (2021: 19%) $ 2,251 $ 3,324
Higher rate of taxation of 30% on Australian underlying earnings (2021: 30%) 924 1,609
Other tax rates applicable outside the UK and Australia on underlying earnings 60 77
Impact of items excluded in arriving at underlying earnings:    
– Losses/gains on foreign exchange and on derivatives (61) (34)
– Losses from increases to closure estimates (non-operating and fully impaired sites) 6 (9)
– Utilisation of capital losses on the gain recognised by Kitimat relating to LNG Canada's project (13) 0
Impact of changes in tax rates and laws (12) 0
Recognition of previously unrecognised deferred tax assets (209) (77)
Write-down of previously recognised deferred tax assets 8 8
Adjustments in respect of prior periods (137) 43
Other items 85 40
Total taxation charge 2,902 4,981
Income tax on share of profit of equity accounted units $ (289) $ (318)
Weighted average statutory tax rate 29.00% 29.00%