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Segmentation of key figures - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Operating Segments [Abstract]        
Number of reporting segments | segment 2   2  
Disclosure of operating segments [line items]        
Segment contribution $ (6) $ 378 $ 368 $ 764
Surgical        
Disclosure of operating segments [line items]        
Segment contribution (28) 235 180 463
Vision Care        
Disclosure of operating segments [line items]        
Segment contribution $ 22 143 $ 188 301
Reclassification of Fair Value Adjustments of Contingent Consideration Liability | Surgical        
Disclosure of operating segments [line items]        
Segment contribution   18   23
Reclassification of Fair Value Adjustments of Contingent Consideration Liability | Vision Care        
Disclosure of operating segments [line items]        
Segment contribution   $ 8   $ 19