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Classification and measurement of financial instruments - Summary of Fair Value Measurement Hierarchy of Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Derivative financial instruments | $ 1 | $ 8
Liabilities |  |
Derivative financial instruments | (20) |
Contingent purchase consideration | (91) | (109)
Deferred purchase consideration | (23) | (22)
Loans and other borrowings | (2,165) | (2,014)
Deferred purchase consideration [member] |  |
Liabilities |  |
Deferred purchase consideration | (23) | (22)
Money Market Fund [Member] |  |
Assets |  |
Financial assets | 51 | 92
Quoted equity shares [member] |  |
Assets |  |
Equity securities | 133 | 116
Financial assets at fair value through profit or loss, category [member] |  |
Assets |  |
Financial assets | 55 | 100
Financial assets at fair value through profit or loss, category [member] | Money Market Fund [Member] |  |
Assets |  |
Financial assets | 3 |
Financial assets at fair value through profit or loss, category [member] | Trade deposits and loans [member] |  |
Assets |  |
Financial assets | 3 |
GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (528) | (509)
GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (399) | (385)
GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (462) | (447)
EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (564) | (569)
Fair value [member] |  |
Liabilities |  |
Derivative financial instruments | (20) |
Contingent purchase consideration | (91) | (109)
Deferred purchase consideration | (24) | (22)
Fair value [member] | Money Market Fund [Member] |  |
Assets |  |
Financial assets | 51 | 92
Fair value [member] | Trade deposits and loans [member] |  |
Assets |  |
Financial assets | 3 |
Fair value [member] | Derivative financial assets [member] |  |
Assets |  |
Derivative financial instruments | 1 | 8
Fair value [member] | Quoted equity shares [member] |  |
Assets |  |
Equity securities | 133 | 116
Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (567) | (543)
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (435) | (399)
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (465) | (417)
Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (601) | (566)
Level 1 [member] | Fair value [member] |  |
Liabilities |  |
Deferred purchase consideration | (24) | (22)
Level 1 [member] | Fair value [member] | Money Market Fund [Member] |  |
Assets |  |
Financial assets | 51 | 92
Level 1 [member] | Fair value [member] | Quoted equity shares [member] |  |
Assets |  |
Equity securities | 8 | 8
Level 1 [member] | Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (567) | (543)
Level 1 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (435) | (399)
Level 1 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (465) | (417)
Level 1 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (601) | (566)
Level 2 [member] | Fair value [member] |  |
Liabilities |  |
Derivative financial instruments | (20) |
Level 2 [member] | Fair value [member] | Quoted equity shares [member] |  |
Assets |  |
Derivative financial instruments | 1 | 8
Level 3 [member] | Trade deposits and loans [member] |  |
Assets |  |
Financial assets | 3 |
Level 3 [member] | Fair value [member] |  |
Liabilities |  |
Contingent purchase consideration | (91) | (109)
Level 3 [member] | Fair value [member] | Quoted equity shares [member] |  |
Assets |  |
Equity securities | $ 125 | $ 108

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