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Segment Information - Additional balance sheet disclosure (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Goodwill $ 8,905 $ 8,899
Intangible assets other than goodwill 10,231 10,679
Operating segments [member] | Surgical [member]    
Disclosure of operating segments [line items]    
Goodwill 4,544 4,538
Intangible assets other than goodwill 5,770 6,053
Operating segments [member] | Vision Care [member]    
Disclosure of operating segments [line items]    
Goodwill 4,361 4,361
Intangible assets other than goodwill 1,481 1,646
Unallocated amounts [member]    
Disclosure of operating segments [line items]    
Goodwill 0 0
Intangible assets other than goodwill $ 2,980 $ 2,980