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Property, plant and equipment (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment $ (414) $ (384) $ (447)
Reversal of impairment charge 7 103 7
Innovative Medicines      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment (411) (315) (326)
Reversal of impairment charge 4 44 2
Sandoz      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment (3) (68) (121)
Reversal of impairment charge $ 3 59 $ 5
Corporate      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment   $ (1)