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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)