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Financial instruments - additional disclosures (Details 6) - Recurring fair value measurement [member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | $ (1,263) | $ (1,250)
Contingent consideration payables [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (1,046) | (1,036)
Other financial liabilities [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (23) | (29)
Derivative financial instruments [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (194) | (185)
Level 2 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (194) | (185)
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (194) | (185)
Level 3 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (1,069) | (1,065)
Level 3 of fair value hierarchy [member] | Contingent consideration payables [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | (1,046) | (1,036)
Level 3 of fair value hierarchy [member] | Other financial liabilities [member] |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Financial liabilities, at fair value | $ (23) | $ (29)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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