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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets |  |  |  |  |
Derivative financial instruments |  | $ (13) | $ (19) |  |
Liabilities |  |  |  |  |
Derivative financial instruments |  | (18) | (20) |  |
Contingent purchase consideration |  | (79) | (91) |  |
Deferred purchase consideration |  | (11) | (23) |  |
Loans and other borrowings |  | (3,767) | (2,165) |  |
Deferred compensation plan liabilities |  | (236) | (218) |  | $ (193)
Deferred purchase consideration [member] |  |  |  |  |
Liabilities |  |  |  |  |
Deferred purchase consideration |  | (24) | (23) |  |
Money Market Fund [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 907 | 51 |  |
Deferred Compensation Plan Investments [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 236 | 218 |  |
Quoted equity shares [member] |  |  |  |  |
Assets |  |  |  |  |
Equity securities |  | 88 | 133 |  |
Financial assets at fair value through profit or loss, category [member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 1,148 | 273 | [1] |
Financial assets at fair value through profit or loss, category [member] | Money Market Fund [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets | [1] |  | 3 |  |
Financial assets at fair value through profit or loss, category [member] | Trade deposits and loans [member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  |  | 3 |  |
GBP173m 3.875% bonds 2022 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (235) | (528) |  |
EUR500m 1.625% bonds 2024 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (611) |  |  |
GBP300m 3.75% bonds 2025 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (413) | (399) |  |
GBP350m 2.125% bonds 2026 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (479) | (462) |  |
EUR500m 2.125% bonds 2027 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (618) | (564) |  |
GBP400m 3.375% bonds 2028 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (542) |  |  |
Fair value [member] |  |  |  |  |
Assets |  |  |  |  |
Derivative financial instruments |  | 5 | 1 |  |
Liabilities |  |  |  |  |
Derivative financial instruments |  | (18) | (20) |  |
Contingent purchase consideration |  | (79) | (91) |  |
Deferred purchase consideration |  | (26) | (24) |  |
Deferred compensation plan liabilities |  | (236) | (218) |  |
Fair value [member] | Money Market Fund [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 907 | 51 |  |
Fair value [member] | Trade deposits and loans [member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  |  | 3 |  |
Fair value [member] | Deferred Compensation Plan Investments [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 236 | 218 |  |
Fair value [member] | Quoted equity shares [member] |  |  |  |  |
Assets |  |  |  |  |
Equity securities |  | 88 | 133 |  |
Fair value [member] | GBP173m 3.875% bonds 2022 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (248) | (567) |  |
Fair value [member] | EUR500m 1.625% bonds 2024 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (630) |  |  |
Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (448) | (435) |  |
Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (489) | (465) |  |
Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (650) | (601) |  |
Fair value [member] | GBP400m 3.375% bonds 2028 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (603) |  |  |
Level 1 [member] | Fair value [member] |  |  |  |  |
Liabilities |  |  |  |  |
Deferred purchase consideration |  | (26) | (24) |  |
Deferred compensation plan liabilities |  | (236) | (218) |  |
Level 1 [member] | Fair value [member] | Money Market Fund [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 907 | 51 |  |
Level 1 [member] | Fair value [member] | Deferred Compensation Plan Investments [Member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  | 236 | 218 |  |
Level 1 [member] | Fair value [member] | Quoted equity shares [member] |  |  |  |  |
Assets |  |  |  |  |
Equity securities |  |  | 8 |  |
Level 1 [member] | Fair value [member] | GBP173m 3.875% bonds 2022 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (248) | (567) |  |
Level 1 [member] | Fair value [member] | EUR500m 1.625% bonds 2024 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (630) |  |  |
Level 1 [member] | Fair value [member] | GBP300m 3.75% bonds 2025 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (448) | (435) |  |
Level 1 [member] | Fair value [member] | GBP350m 2.125% bonds 2026 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (489) | (465) |  |
Level 1 [member] | Fair value [member] | EUR500m 2.125% bonds 2027 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (650) | (601) |  |
Level 1 [member] | Fair value [member] | GBP400m 3.375% bonds 2028 [member] |  |  |  |  |
Liabilities |  |  |  |  |
Loans and other borrowings |  | (603) |  |  |
Level 2 [member] | Fair value [member] |  |  |  |  |
Assets |  |  |  |  |
Derivative financial instruments |  | 1 | 1 |  |
Liabilities |  |  |  |  |
Derivative financial instruments |  | (18) | (20) |  |
Level 3 [member] | Trade deposits and loans [member] |  |  |  |  |
Assets |  |  |  |  |
Financial assets |  |  | 3 |  |
Level 3 [member] | Fair value [member] |  |  |  |  |
Assets |  |  |  |  |
Derivative financial instruments |  | 4 |  |  |
Liabilities |  |  |  |  |
Contingent purchase consideration |  | (79) | (91) |  |
Level 3 [member] | Fair value [member] | Quoted equity shares [member] |  |  |  |  |
Assets |  |  |  |  |
Equity securities |  | $ 88 | $ 125 |  |
[1] | Restated for deferred compensation plan investments, see page 134.

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