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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
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |
At 1 January | $ 4,813 |  |  |
At 31 December | 4,748 | $ 4,813 |  |
At 1 January | (6,759) |  |  |
Unrealised changes in fair value | (4) | (4) |  | $ 8
At 31 December | (7,056) | (6,759) |  |
Other financial assets [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |
At 1 January | 110 | 103 |  |
Valuation losses recognised in other comprehensive income |  | (2) |  |
Additions | 20 | 8 |  |
Unrealised changes in fair value | 0 |  |  |
Repayment and disposals | (4) |  |  |
Exchange and other adjustments |  | 1 |  |
At 31 December | 126 | 110 |  | 103
Contingent purchase consideration [Member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |
Repayment and disposals | 0 |  |  |
At 1 January | (69) | (65) |  |
Additions | 0 |  |  |
Unrealised changes in fair value | (4) | (4) | [1] |
Exchange and other adjustments |  | 0 |  |
At 31 December | (73) | (69) |  | (65)
Other Payables [Member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [line items] |  |  |  |
Repayment and disposals | 0 |  |  |
At 1 January | 0 | (18) |  |
Additions | 0 |  |  |
Unrealised changes in fair value | 0 | 18 | [1] |
Exchange and other adjustments |  | 0 |  |
At 31 December | $ 0 | $ 0 |  | $ (18)
[1] | 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 was presented as an exceptional item (see note [6]).

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