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Non-current and current financial debts - Additional information (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 27, 2020 USD ($) | Sep. 23, 2019 USD ($) | Apr. 02, 2019 USD ($) | Mar. 06, 2019 USD ($) extension | Feb. 28, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 09, 2019 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 94,000,000 | $ 81,000,000 | $ 10,000,000 |
Borrowings, interest rate | 2.60% |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 750,000,000 |  |  |  |  |  |  |  |
Financial debts |  |  |  |  |  | 4,118,000,000 | 3,479,000,000 |  | $ 3,500,000,000
Write-off of deferred debt issuance cost |  | $ 4,000,000 |  |  |  | 0 | $ 4,000,000 | $ 0 |
Debt issuance costs [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Financial debts |  | (15,000,000) |  |  |  |  |  |  |
Bridge facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 1,500,000,000 |  |  |  |  |
Borrowings, term |  |  |  | 364 days |  |  |  |  |
Borrowings, number of extension options | extension |  |  |  | 2 |  |  |  |  |
Borrowings, extension term |  |  |  | 180 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 |  |  |  | $ 1,000,000,000.0 |  | 1,000,000,000.0 |  |  |
Borrowings, term |  |  |  | 5 years |  |  |  |  |
Bridge and other term loans [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  | $ 3,200,000,000 |  |  |  |  |  |
Senior notes [member] | Borrowings discount [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Financial debts |  | $ 7,000,000 |  |  |  |  |  |  |
Senior notes due 2026 [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 2.75% |  |  |  |  |  |  |
Notional amount |  | $ 500,000,000 |  |  |  |  |  |  |
Borrowings, issuance percentage |  | 99.50% |  |  |  |  |  |  |
Senior notes due 2029 [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.00% |  |  |  |  |  |  |
Notional amount |  | $ 1,000,000,000 |  |  |  |  |  |  |
Borrowings, issuance percentage |  | 99.60% |  |  |  |  |  |  |
Senior notes due 2049 [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.80% |  |  |  |  |  |  |
Notional amount |  | $ 500,000,000 |  |  |  |  |  |  |
Borrowings, issuance percentage |  | 99.80% |  |  |  |  |  |  |
Senior notes due 2030 [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.60% |  |  |  |  |  |  |  |
Notional amount | $ 750,000,000 |  |  |  |  |  |  |  |
Proceeds from borrowings | $ 750,000,000 |  |  |  |  |  |  |  |
Borrowings, issuance percentage | 99.843% |  |  |  |  |  |  |  |
Borrowing costs incurred | $ 5,000,000 |  |  |  |  |  |  |  |
Senior notes due 2030 [Member] | Borrowings discount [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Financial debts | $ 1,000,000 |  |  |  |  |  |  |  |
Local bilateral facilities [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, term |  |  |  |  | 1 year |  |  |  |
Financial debts |  |  |  |  | $ 150,000,000 |  |  |  |
Local bilateral facilities, japan [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Financial debts |  |  |  |  | $ 101,000,000 |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  | $ 115,000,000 |  |  |
Weighted average [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 2.30% | 2.90% |  |

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