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Classification and measurement of financial instruments - Summary of Reconciliation of Movements in the Fair Values of Financial Instruments Classified as Level 3 (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |  |  |
At 1 January | [1] | $ 4,216 |  |  |  |
At 31 December |  | 4,813 | $ 4,216 | [1] |  |
At 1 January | [1] | (5,824) |  |  |  |
Unrealised changes in fair value |  | (4) | 8 | [2] | $ 6 | [2]
At 31 December |  | (6,759) | (5,824) | [1] |  |
Other financial assets [member] |  |  |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |  |  |
At 1 January |  | 103 | 106 |  |  |
Valuation losses recognised in other comprehensive income |  | (2) | (1) |  |  |
Additions |  | 8 |  |  |  |
Unrealised changes in fair value | [3] | 0 |  |  |  |
Exchange and other adjustments |  | 1 | (2) |  |  |
At 31 December |  | 110 | 103 |  | 106 |
Contingent purchase consideration [Member] |  |  |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |  |  |
At 1 January |  | (65) | (73) |  |  |
Valuation losses recognised in other comprehensive income |  | 0 |  |  |  |
Unrealised changes in fair value | [3] | (4) | 8 |  |  |
Exchange adjustments |  | 0 |  |  |  |
At 31 December |  | (69) | (65) |  | (73) |
Other Payables [Member] |  |  |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |  |  |
At 1 January |  | (18) | 0 |  |  |
Valuation losses recognised in other comprehensive income |  | 0 |  |  |  |
Unrealised changes in fair value | [3] | 18 | (18) |  |  |
Exchange adjustments |  | 0 |  |  |  |
At 31 December |  | $ 0 | $ (18) |  | $ 0 |
[1] | Re-presented for the adoption of IFRS 17 ‘Insurance Contracts’ (see New accounting standards and other presentational changes).
[2] | Re-presented for the adoption of IFRS 17 ‘Insurance Contracts’ and to combine System Fund revenues and reimbursables (see New accounting standards and other presentational changes).
[3] | The change in the fair value of other payables was recognised within share of profits/(losses) from associates and joint ventures in the Group income statement and is presented as an exceptional item (see note 6).

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