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Income taxes - Significant components of income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Major components of tax (expense) income [abstract]      
Current income tax expense in respect of current year $ (7,892) $ (10,724) $ (7,680)
Prior period adjustments 69 (49) (124)
Current income tax expense (7,822) (10,773) (7,805)
Origination and reversal of temporary differences 410 (1,359) (904)
Recognition of previously unrecognised deferred tax assets 0 923 0
Change in tax regulations (6) (28) (14)
Prior period adjustments (23) (99) (100)
Deferred tax expense 381 (563) (1,017)
Income tax expense $ (7,441) $ (11,335) $ (8,822)