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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