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Financial instruments - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 02, 2019
USD ($)
Mar. 06, 2019
USD ($)
extension
Feb. 28, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]              
Contingent liabilities recognised in business combination       $ 630,000,000 $ 630,000,000    
Interest expense       27,000,000 31,000,000    
Proceeds from borrowings $ 3,200,000,000            
Financial debts 3,500,000,000     3,522,000,000 3,522,000,000   $ 47,000,000
Borrowings, term   5 years          
Derivative liabilities, net       (11,000,000) (11,000,000)    
Gains on change in fair value of derivatives       1,000,000 1,000,000    
Losses on change in fair value of derivatives       $ 12,000,000 12,000,000    
Bridge facility [member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 1,500,000,000          
Borrowings, number of extension options | extension   2          
Borrowings, extension term   180 days          
Borrowings, term   364 days          
Facility A [Member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 500,000,000          
Borrowings, term   3 years          
Facility B [Member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 800,000,000          
Borrowings, term   5 years          
Facility C [Member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 400,000,000          
Borrowings, term   5 years          
Revolving Facility [Member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount   $ 1,000,000,000          
Term Loans [Member]              
Disclosure of detailed information about borrowings [line items]              
Proceeds from borrowings $ 3,200,000,000            
Local Bilateral Facilities [Member]              
Disclosure of detailed information about borrowings [line items]              
Financial debts     $ 300,000,000        
Borrowings, term     1 year        
Local Bilateral Facilities, Japan [Member]              
Disclosure of detailed information about borrowings [line items]              
Financial debts     $ 100,000,000        
Contingent consideration payables [member]              
Disclosure of detailed information about borrowings [line items]              
Purchases, fair value measurement, liabilities         135,000,000 $ 0  
Adjustments for change in assumptions         (13,000,000) 0  
Accretion for passage of time         $ (9,000,000) $ (10,000,000)