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Non-current and current financial debts - Additional information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about borrowings [line items]        
Interest expense $ 24 $ 23 $ 48 $ 46
Local facilities (Japan) | Minimum        
Disclosure of detailed information about borrowings [line items]        
Borrowings term     1 year  
Local facilities (Japan) | Maximum        
Disclosure of detailed information about borrowings [line items]        
Borrowings term     2 years