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Financial risk management and derivative financial instruments - Summary of Interest and Foreign Exchange Risk Sensitivities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Impact on (loss) profit before tax [member] | Currency risk [member] | Sterling US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | $ (38) | $ (14) | $ (3)
Impact on (loss) profit before tax [member] | Currency risk [member] | Euro US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | (7) | (3) |
Impact on (loss) profit before tax [member] | Interest rate risk [member] | US dollar interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 1% increase interest rates | 4 | 2 | 4
Impact on (loss) profit before tax [member] | Interest rate risk [member] | Sterling interest rates [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 1% increase interest rates | 3 | 9 | 4
Impact on net liabilities [member] | Currency risk [member] | Sterling US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 3 | (12) | 27
Impact on net liabilities [member] | Currency risk [member] | Euro US dollar exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | 25 | 49 | 50
Impact on net liabilities [member] | Currency risk [member] | Sterling: Euro exchange rate [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 5 cent fall in exchange rate | $ 31 | $ 64 | $ 60

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