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Income taxes - Current and deferred (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes      
Current income taxes $ (12,745) $ (19,825) $ (8,158)
Deferred income taxes (556) (2,417) (1,429)
TOTAL INCOME TAXES $ (13,301) $ (22,242) $ (9,587)