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Classification and measurement of financial instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | $ (111) | $ (109)
Financial liabilities at fair value through profit or loss, category [member] | Contingent purchase consideration [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (91) | (109)
Financial liabilities at amortised cost, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (2,758) | (2,646)
Financial liabilities at amortised cost, category [member] | 'Long-term borrowings [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (2,165) | (2,014)
Financial liabilities at amortised cost, category [member] | Deferred purchase consideration [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (23) | (22)
Financial liabilities at amortised cost, category [member] | Trade and other payables, excluding deferred and contingent purchase consideration [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (570) | (610)
Cash and cash equivalent [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 35 | 76
Derivative financial instruments [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial Liabilities | (20) |
Money market fund [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 51 | 92
Financial assets measured at fair value through other comprehensive income [Member] | Equity securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 133 | 116
Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 55 | 100
Financial assets at fair value through profit or loss, category [member] | Other Financial Asset [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 16 | 16
Financial assets at fair value through profit or loss, category [member] | Derivative financial instruments [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 1 | 8
Financial assets at fair value through profit or loss, category [member] | Money market fund [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 3 |
Financial assets at amortised cost, category [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 848 | 1,259
Financial assets at amortised cost, category [member] | Cash and cash equivalent [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 160 | 628
Financial assets at amortised cost, category [member] | Other Financial Asset [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | 136 | 129
Financial assets at amortised cost, category [member] | Trade and other receivables, excluding prepayments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets | $ 552 | $ 502

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + 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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