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Financial instruments - Additional information (Details) - USD ($) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
May 27, 2020 | Apr. 02, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contingent liabilities recognised in business combination |  |  | $ 490,000,000 |  |
Derivative liabilities, net |  |  | 1,000,000 |  | $ (15,000,000)
Gains on change in fair value of derivatives |  |  | 2,000,000 |  | 1,000,000
Losses on change in fair value of derivatives |  |  | (1,000,000) |  | $ (16,000,000)
Proceeds from borrowings |  | $ 3,200,000,000 |  |  |
Series 2030 notes |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Notional amount | $ 750,000,000 |  |  |  |
Proceeds from borrowings | $ 750,000,000 |  |  |  |
Borrowings, interest rate | 2.60% |  |  |  |
Revolving facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Notional amount |  |  | 1,000,000,000.0 |  |
Contingent consideration liabilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Purchases, fair value measurement, liabilities |  |  |  | $ 135,000,000 |
Level 3 | Contingent consideration liabilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Adjustments for changes in assumptions |  |  | 40,000,000 | 13,000,000 |
Payments |  |  | 20,000,000 | 0 |
Purchases, fair value measurement, liabilities |  |  | $ 0 | $ 135,000,000 |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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