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Segment Information - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
segment
Disclosure of operating segments [line items]      
Number of reporting segments | segment     2
Surgical [member]      
Disclosure of operating segments [line items]      
Segment contribution, increase (decrease) $ 34 $ 33  
Vision Care [member]      
Disclosure of operating segments [line items]      
Segment contribution, increase (decrease) $ 17 $ 6