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Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [line items] |  |  |
Income before taxes | $ 9,878 | $ 8,940 | $ 14,095
Continuing operations [member] |  |  |
Statement [line items] |  |  |
Income before taxes | 9,878 | 8,940 | 14,095
Continuing operations [member] | Switzerland |  |  |
Statement [line items] |  |  |
Income before taxes | 9,786 | 8,097 | 11,887
Continuing operations [member] | Foreign |  |  |
Statement [line items] |  |  |
Income before taxes | $ 92 | 843 | 2,208
Discontinued operations [member] |  |  |
Statement [line items] |  |  |
Income before taxes |  | $ 58 | $ (260)

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