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Non-current and current financial debts - Schedule of financial debts (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Apr. 02, 2019
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts $ 3,909 $ 3,218  
Current financial debts 235 261  
Borrowings 4,144 3,479 $ 3,500
Facility B      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 794 793  
Facility C      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 391 391  
Local facilities (Japan)      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 0 55  
Current financial debts 137 115  
Series 2026 notes      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 495 495  
Series 2029 notes      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 991 991  
Series 2030 notes      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 744 0  
Series 2049 notes      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 494 493  
Revolving facility      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 0 0  
Local facilities, all others      
Disclosure of detailed information about borrowings [line items]      
Current financial debts 71 101  
Other short-term financial debts      
Disclosure of detailed information about borrowings [line items]      
Current financial debts 26 29  
Derivatives      
Disclosure of detailed information about borrowings [line items]      
Current financial debts $ 1 $ 16