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Associated companies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]      
Net income statement effect $ (9) $ 15,339 $ 673
Other comprehensive income effect   46 (56)
Total comprehensive income effect (9) 15,385 617
Recycling of the Novartis share of other comprehensive income from associated companies 0 3  
Roche Holding AG, Switzerland      
Disclosure of associates [line items]      
Net income statement effect   15,341 677
Other comprehensive income effect   46 (56)
Total comprehensive income effect   15,387 621
Others      
Disclosure of associates [line items]      
Net income statement effect (9) (2) (4)
Total comprehensive income effect $ (9) $ (2) $ (4)