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Fair value measurement - Summary of Reconciliation of Movements in the Fair Values of Financial Instruments Classified as Level 3 (Detail) - Level 3 [member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Equity securities [member] |  |
Disclosure of other financial assets [line items] |  |
At 1 January | $ 117 | $ 142
Additions | 4 | 2
Acquisition of businesses (note 11) | 0 |
Disposals | (1) | (3)
Valuation gains recognised in other comprehensive income | (10) | 48
Valuation gains reclassified to the income statement on disposal |  | (73)
Contingent consideration paid | 0 |
Change in fair value recorded in finance costs | 0 |
Exchange and other adjustments | (2) | 1
At 31 December | 108 | 117
Deferred and contingent purchase consideration [member] |  |
Disclosure of other financial assets [line items] |  |
At 1 January | 0 |
Additions | 0 |
Acquisition of businesses (note 11) | 131 |
Disposals | 0 |
Valuation gains recognised in other comprehensive income | 0 |
Contingent consideration paid | (4) |
Change in fair value recorded in finance costs | 5 |
Exchange and other adjustments | (1) |
At 31 December | $ 131 | $ 0

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- Definition The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2018-03-16 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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