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Financial instruments - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 02, 2019 USD ($) | Mar. 06, 2019 USD ($) extension | Feb. 28, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Contingent liabilities recognised in business combination |  |  |  | $ 630,000,000 | $ 630,000,000 |  |
Interest expense |  |  |  | 27,000,000 | 31,000,000 |  |
Proceeds from borrowings | $ 3,200,000,000 |  |  |  |  |  |
Financial debts | 3,500,000,000 |  |  | 3,522,000,000 | 3,522,000,000 |  | $ 47,000,000
Borrowings, term |  | 5 years |  |  |  |  |
Derivative liabilities, net |  |  |  | (11,000,000) | (11,000,000) |  |
Gains on change in fair value of derivatives |  |  |  | 1,000,000 | 1,000,000 |  |
Losses on change in fair value of derivatives |  |  |  | $ 12,000,000 | 12,000,000 |  |
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 |  |  |  |  |
Term Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from borrowings | $ 3,200,000,000 |  |  |  |  |  |
Local Bilateral Facilities [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Financial debts |  |  | $ 300,000,000 |  |  |  |
Borrowings, term |  |  | 1 year |  |  |  |
Local Bilateral Facilities, Japan [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Financial debts |  |  | $ 100,000,000 |  |  |  |
Contingent consideration payables [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Purchases, fair value measurement, liabilities |  |  |  |  | 135,000,000 | $ 0 |
Adjustments for change in assumptions |  |  |  |  | (13,000,000) | 0 |
Accretion for passage of time |  |  |  |  | $ (9,000,000) | $ (10,000,000) |

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