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Taxes (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [line items]      
Income tax expense $ (1,807) $ (1,793) $ (1,295)
Continuing operations [member]      
Statement [line items]      
Current tax expense (income) (2,100) (2,147) (1,603)
Deferred tax expense (income) 293 354 308
Income tax expense (1,807) (1,793) (1,295)
Continuing operations [member] | Switzerland      
Statement [line items]      
Current tax expense (income) (932) (1,186) (615)
Deferred tax expense (income) (137) (93) (120)
Continuing operations [member] | Foreign      
Statement [line items]      
Current tax expense (income) (1,168) (961) (988)
Deferred tax expense (income) $ 430 447 428
Discontinued operations [member]      
Statement [line items]      
Income tax expense   $ (159) $ 74