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Fair value measurement - Summary of Fair Value Measurement Hierarchy of Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | $ 116 | $ 127
Derivatives | 8 |
Liabilities |  |
Deferred and contingent purchase consideration | (131) |
Loans and other borrowings | (2,249) | (2,019)
GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (509) | (538)
GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (385) | (406)
GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (447) | (472)
EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (569) |
Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (235) | (231)
Fair value [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 116 | 127
Derivatives | 8 |
Liabilities |  |
Deferred and contingent purchase consideration | (131) |
Fair value [member] | Quoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 8 | 10
Fair value [member] | Unquoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 108 | 117
Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (543) | (593)
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (399) | (441)
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (417) | (454)
Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (566) |
Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (313) | (318)
Level 1 [member] | Fair value [member] |  |
Equity securities measured at fair value: |  |
Derivatives | 0 |
Liabilities |  |
Deferred and contingent purchase consideration | 0 |
Level 1 [member] | Fair value [member] | Quoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 8 | 10
Level 1 [member] | Fair value [member] | Unquoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 0 |
Level 1 [member] | Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (543) | (593)
Level 1 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (399) | (441)
Level 1 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (417) | (454)
Level 1 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (566) |
Level 1 [member] | Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 2 [member] | Fair value [member] |  |
Equity securities measured at fair value: |  |
Derivatives | 8 |
Liabilities |  |
Deferred and contingent purchase consideration | 0 |
Level 2 [member] | Fair value [member] | Quoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 0 |
Level 2 [member] | Fair value [member] | Unquoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 0 |
Level 2 [member] | Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 2 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 2 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 2 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 2 [member] | Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | (313) | (318)
Level 3 [member] | Fair value [member] |  |
Equity securities measured at fair value: |  |
Derivatives | 0 |
Liabilities |  |
Deferred and contingent purchase consideration | (131) |
Level 3 [member] | Fair value [member] | Quoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 0 |
Level 3 [member] | Fair value [member] | Unquoted equity shares [member] |  |
Equity securities measured at fair value: |  |
Equity securities measured at fair value: | 108 | $ 117
Level 3 [member] | Fair value [member] | GBP400m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 3 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 3 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 3 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | 0 |
Level 3 [member] | Fair value [member] | Finance lease obligations [member] |  |
Liabilities |  |
Loans and other borrowings | $ 0 |

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