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Income taxes - Significant components of income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major components of tax (expense) income [abstract]      
Current income tax expense in respect of current year $ (21,271) $ (1,115) $ (7,892)
Prior period adjustments (28) 313 69
Current income tax expense (21,299) (802) (7,822)
Origination and reversal of temporary differences (1,778) (648) 410
Recognition of previously unrecognised deferred tax assets 126 130 0
Change in tax regulations 4 (12) (6)
Prior period adjustments (60) 94 (23)
Deferred tax expense (1,708) (435) 381
Income tax expense $ (23,007) $ (1,237) $ (7,441)