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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

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