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Significant transactions (Details) - USD ($)
 12 Months Ended
Apr. 02, 2019
Mar. 13, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 23, 2019
Apr. 09, 2019
Dec. 19, 2018
Dec. 17, 2018
Sep. 20, 2017
Disclosure of detailed information about business combination [line items]                    
Financial debts     $ 3,479,000,000 $ 47,000,000            
Cash paid for intercompany transactions related to spin-off $ 3,100,000,000                  
Net assets             $ 20,000,000,000.0      
Net identifiable assets acquired     418,000,000 287,000,000 $ 123,000,000          
Deferred tax assets     28,000,000 12,000,000 8,000,000          
Cash and cash equivalents     6,000,000 5,000,000 1,000,000          
Deferred tax liabilities recognised as of acquisition date     121,000,000 78,000,000 64,000,000          
Goodwill     6,000,000 4,000,000 2,000,000          
Consideration paid (received)     $ 283,000,000 $ 239,000,000 $ 70,000,000          
PowerVision, Inc. [Member]                    
Disclosure of detailed information about business combination [line items]                    
Percentage of voting equity interests acquired   100.00%                
Consideration transferred, acquisition-date fair value   $ 424,000,000                
Cash transferred   289,000,000                
Contingent liabilities recognised as of acquisition date   135,000,000                
Net identifiable assets acquired   418,000,000                
Identifiable intangible assets recognised as of acquisition date   505,000,000                
Deferred tax liabilities recognised as of acquisition date   93,000,000                
Other net assets recognised as of acquisition date   6,000,000                
Goodwill   6,000,000                
Consideration paid (received)   $ 283,000,000                
TrueVision Systems, Inc. [Member]                    
Disclosure of detailed information about business combination [line items]                    
Percentage of voting equity interests acquired               100.00%    
Consideration transferred, acquisition-date fair value               $ 146,000,000    
Cash transferred               110,000,000    
Contingent liabilities recognised as of acquisition date               36,000,000    
Net identifiable assets acquired               144,000,000    
Identifiable intangible assets recognised as of acquisition date               172,000,000    
Deferred tax liabilities recognised as of acquisition date               29,000,000    
Other net assets recognised as of acquisition date               1,000,000    
Goodwill               $ 2,000,000    
Tear Film Innovations, Inc. [Member]                    
Disclosure of detailed information about business combination [line items]                    
Percentage of voting equity interests acquired                 100.00%  
Consideration transferred, acquisition-date fair value                 $ 145,000,000  
Cash transferred                 79,000,000  
Contingent liabilities recognised as of acquisition date                 66,000,000  
Net identifiable assets acquired                 143,000,000  
Identifiable intangible assets recognised as of acquisition date                 174,000,000  
Cash and cash equivalents                 5,000,000  
Deferred tax liabilities recognised as of acquisition date                 37,000,000  
Other net assets recognised as of acquisition date                 1,000,000  
Goodwill                 $ 2,000,000  
ClarVista Medical, Inc. [Member]                    
Disclosure of detailed information about business combination [line items]                    
Percentage of voting equity interests acquired                   100.00%
Consideration transferred, acquisition-date fair value                   $ 125,000,000
Cash transferred                   71,000,000
Contingent liabilities recognised as of acquisition date                   54,000,000
Net identifiable assets acquired                   123,000,000
Identifiable intangible assets recognised as of acquisition date                   178,000,000
Deferred tax assets                   8,000,000
Cash and cash equivalents                   1,000,000
Deferred tax liabilities recognised as of acquisition date                   64,000,000
Goodwill                   $ 2,000,000
Senior Notes [Member]                    
Disclosure of detailed information about business combination [line items]                    
Notional amount           $ 2,000,000,000.0        
Senior notes due 2026 [member]                    
Disclosure of detailed information about business combination [line items]                    
Notional amount           $ 500,000,000        
Borrowings, interest rate           2.75%        
Senior notes due 2029 [member]                    
Disclosure of detailed information about business combination [line items]                    
Notional amount           $ 1,000,000,000.0        
Borrowings, interest rate           3.00%        
Senior notes due 2049 [member]                    
Disclosure of detailed information about business combination [line items]                    
Notional amount           $ 500,000,000        
Borrowings, interest rate           3.80%        
Bridge and other term loans [member]                    
Disclosure of detailed information about business combination [line items]                    
Proceeds from borrowings $ 3,200,000,000