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Income taxes (Details 1) - USD ($) $ in Millions | 12 Months Ended
--- | ---
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

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