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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, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities |  |
Loans and other borrowings | $ (2,845) | $ (3,767)
Deferred purchase consideration [member] |  |
Liabilities |  |
Deferred purchase consideration | (12) | (24)
GBP173m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (233) | (235)
EUR500m 1.625% bonds 2024 [member] |  |
Liabilities |  |
Loans and other borrowings | (565) | (611)
GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (408) | (413)
GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (473) | (479)
GBP400m 3.375% bonds 2028 [member] |  |
Liabilities |  |
Loans and other borrowings | (537) | (542)
EUR500m 1.625% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | (570) | (618)
Fair value [member] |  |
Liabilities |  |
Deferred purchase consideration | (13) | (26)
Fair value [member] | GBP173m 3.875% bonds 2022 [member] |  |
Liabilities |  |
Loans and other borrowings | (239) | (248)
Fair value [member] | EUR500m 1.625% bonds 2024 [member] |  |
Liabilities |  |
Loans and other borrowings | (585) | (630)
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |
Liabilities |  |
Loans and other borrowings | (428) | (448)
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |
Liabilities |  |
Loans and other borrowings | (471) | (489)
Fair value [member] | GBP400m 3.375% bonds 2028 [member] |  |
Liabilities |  |
Loans and other borrowings | (566) | (603)
Fair value [member] | EUR500m 1.625% bonds 2027 [member] |  |
Liabilities |  |
Loans and other borrowings | $ (601) | $ (650)

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