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Fair value measurement - Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financial assets |  |  |
Equity securities | $ 116 | $ 127 |
Derivatives | 8 |  |
Financial assets measured at fair value | 124 | 127 |
Deferred and contingent purchase consideration | (131) |  |
Financial assets measured at amortised cost: |  |  |
Cash and cash equivalents | 704 | 168 | $ 206
Loans and other receivables: |  |  |
Other financial assets | 145 | 117 |
Trade and other receivables, excluding prepayments | 502 | 477 |
Financial assets at amortised cost and loans and other receivables | 1,351 | 762 |
Financial assets | 1,475 | 889 |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (2,249) | (2,019) |
Trade and other payables | (645) | (633) |
Provisions | (27) | (8) |
Financial liabilities at amortised cost | (2,921) | (2,660) |
Financial Liabilities | (3,052) | (2,660) |
GBP400m 3.875% bonds 2022 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (509) | (538) |
GBP300m 3.75% bonds 2025 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (385) | (406) |
GBP350m 2.125% bonds 2026 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (447) | (472) |
EUR500m 2.125% bonds 2027 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (569) |  |
Finance lease obligations [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (235) | (231) |
Unsecured bank loans [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | 0 | (262) |
Borrowings [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (104) | (110) |
Fair value [member] |  |  |
Financial assets |  |  |
Equity securities | 116 | 127 |
Derivatives | 8 |  |
Financial assets measured at fair value | 124 | 127 |
Deferred and contingent purchase consideration | (131) |  |
Financial assets measured at amortised cost: |  |  |
Cash and cash equivalents | 704 | 168 |
Loans and other receivables: |  |  |
Other financial assets | 145 | 117 |
Trade and other receivables, excluding prepayments | 502 | 477 |
Financial assets at amortised cost and loans and other receivables | 1,351 | 762 |
Financial assets | 1,475 | 889 |
Financial liabilities measured at amortised cost: |  |  |
Trade and other payables | (645) | (633) |
Provisions | (27) | (8) |
Financial liabilities at amortised cost | (3,014) | (2,819) |
Financial Liabilities | (3,145) | (2,819) |
Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (543) | (593) |
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (399) | (441) |
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (417) | (454) |
Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (566) |  |
Fair value [member] | Finance lease obligations [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | (313) | (318) |
Fair value [member] | Unsecured bank loans [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | 0 | (262) |
Fair value [member] | Borrowings [member] |  |  |
Financial liabilities measured at amortised cost: |  |  |
Loans and other borrowings | $ (104) | $ (110) |

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