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Non-current and current financial debts - Additional information (Details)
 1 Months Ended 12 Months Ended
Sep. 23, 2019
USD ($)
Apr. 02, 2019
USD ($)
Mar. 06, 2019
USD ($)
extension
Feb. 28, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]              
Interest expense         $ 81,000,000 $ 10,000,000 $ 12,000,000
Financial debts         3,479,000,000 47,000,000  
Write-off of deferred debt issuance cost $ 4,000,000       4,000,000 0 $ 0
Derivative liabilities, net         (15,000,000)    
Gains on change in fair value of derivatives         1,000,000 0  
Losses on change in fair value of derivatives         16,000,000    
Current financial debts         $ 261,000,000 $ 47,000,000  
Weighted average [member]              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate         2.90% 17.40%  
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     $ 1,000,000,000.0        
Borrowings, term     5 years        
Senior Notes [Member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount 2,000,000,000.0            
Bridge and other term loans [member]              
Disclosure of detailed information about borrowings [line items]              
Proceeds from borrowings   $ 3,200,000,000          
Senior notes due 2026 [member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount $ 500,000,000            
Borrowings, issuance percentage 99.50%            
Borrowings, interest rate 2.75%            
Senior notes due 2029 [member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount $ 1,000,000,000.0            
Borrowings, issuance percentage 99.60%            
Borrowings, interest rate 3.00%            
Senior notes due 2049 [member]              
Disclosure of detailed information about borrowings [line items]              
Notional amount $ 500,000,000            
Borrowings, issuance percentage 99.80%            
Borrowings, interest rate 3.80%            
Local bilateral facilities [member]              
Disclosure of detailed information about borrowings [line items]              
Borrowings, term       1 year      
Financial debts       $ 300,000,000      
Local bilateral facilities, japan [member]              
Disclosure of detailed information about borrowings [line items]              
Undrawn borrowing facilities         $ 35,000,000    
Financial debts       $ 200,000,000      
Other short-term financial debts [member]              
Disclosure of detailed information about borrowings [line items]              
Current financial debts         $ 29,000,000 $ 15,000,000  
Borrowings discount [Member] | Senior Notes [Member]              
Disclosure of detailed information about borrowings [line items]              
Financial debts $ 7,000,000.0            
Debt issuance costs [Member]              
Disclosure of detailed information about borrowings [line items]              
Financial debts $ (15,000,000)