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Segmentation of key figures - Additional balance sheet disclosure (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Goodwill $ 8,905 $ 8,899
Intangible assets other than goodwill 10,719 10,679
Operating segments [member] | Surgical [Member]    
Disclosure of operating segments [line items]    
Goodwill 4,544 4,538
Intangible assets other than goodwill 6,181 6,053
Operating segments [member] | Vision Care [Member]    
Disclosure of operating segments [line items]    
Goodwill 4,361 4,361
Intangible assets other than goodwill 1,558 1,646
Not allocated [member]    
Disclosure of operating segments [line items]    
Goodwill 0 0
Intangible assets other than goodwill $ 2,980 $ 2,980