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Goodwill and intangible assets - Intangible asset impairment charges (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Intangible asset impairment charges $ 0 $ (378,000,000) $ (57,000,000)
CyPass [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible asset impairment charges   (337,000,000)  
Optonol Ltd. [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible asset impairment charges   39,000,000  
Surgical [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible asset impairment charges 0 (378,000,000)  
Vision Care [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible asset impairment charges $ 0 $ 0