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Financial instruments - Schedule of financial debts (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Apr. 02, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts $ 1,751   $ 0
Current financial debts 1,771   47
Total financial debts 3,522 $ 3,500 47
Facility A [Member]      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 498   0
Facility B [Member]      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 792   0
Facility C [Member]      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 396   0
Local Facilities, Japan [Member]      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 65   0
Current financial debts 86   0
Revolving Facility [Member]      
Disclosure of detailed information about borrowings [line items]      
Non-current financial debts 0   0
Bridge facility [member]      
Disclosure of detailed information about borrowings [line items]      
Current financial debts 1,496   0
Local Facilities, Other [Member]      
Disclosure of detailed information about borrowings [line items]      
Current financial debts 129   32
Other Short-term Financial Debts [Member]      
Disclosure of detailed information about borrowings [line items]      
Current financial debts 48   15
Derivatives [member]      
Disclosure of detailed information about borrowings [line items]      
Current financial debts $ 12   $ 0