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Income taxes (Details 1) - USD ($) $ in Millions	12 Months Ended
Income taxes (Details 1) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement [line items]
Current tax expense (income)	$ (2,071)	$ (2,428)	$ (2,100)
Deferred tax expense (income)	655	309	293
Income tax expense	(1,416)	(2,119)	(1,807)
Switzerland
Statement [line items]
Current tax expense (income)	(617)	(958)	(932)
Deferred tax expense (income)	(142)	23	(137)
Foreign
Statement [line items]
Current tax expense (income)	(1,454)	(1,470)	(1,168)
Deferred tax expense (income)	$ 797	$ 286	$ 430

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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