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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

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