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Income taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statement [line items] |  |  |
Income before taxes | $ 8,371 | $ 26,137 | $ 9,878
Switzerland |  |  |
Statement [line items] |  |  |
Income before taxes | 5,986 | 22,028 | 9,786
Foreign |  |  |
Statement [line items] |  |  |
Income before taxes | $ 2,385 | $ 4,109 | $ 92

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