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Significant transactions (Details) - USD ($)
$ in Millions
 6 Months Ended
Apr. 02, 2019
Mar. 13, 2019
Dec. 17, 2018
Jun. 30, 2019
Jun. 30, 2018
Apr. 09, 2019
Dec. 31, 2018
Dec. 19, 2018
Disclosure of detailed information about business combination [line items]                
Proceeds from borrowings $ 3,200              
Financial debts 3,500     $ 3,522     $ 47  
Cash paid for intercompany transactions related to spin-off $ 3,100              
Net assets           $ 20,000    
Consideration paid (received)       $ 283 $ 0      
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            
Cash transferred   289            
Contingent liabilities recognised as of acquisition date   135            
Identifiable assets acquired (liabilities assumed)   418            
Identifiable intangible assets recognised as of acquisition date   505            
Deferred tax liabilities recognised as of acquisition date   93            
Consideration paid (received)   283            
Other net assets recognised as of acquisition date   6            
Goodwill recognised as of acquisition date   $ 6            
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
Cash transferred               110
Contingent liabilities recognised as of acquisition date               36
Identifiable assets acquired (liabilities assumed)               144
Identifiable intangible assets recognised as of acquisition date               172
Deferred tax liabilities recognised as of acquisition date               29
Other net assets recognised as of acquisition date               1
Goodwill recognised as of acquisition date               $ 2
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          
Cash transferred     79          
Contingent liabilities recognised as of acquisition date     66          
Identifiable assets acquired (liabilities assumed)     143          
Identifiable intangible assets recognised as of acquisition date     174          
Deferred tax liabilities recognised as of acquisition date     37          
Consideration paid (received)     5          
Other net assets recognised as of acquisition date     1          
Goodwill recognised as of acquisition date     $ 2