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Tax - Summary of Tax on (Loss)/Profit (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income tax [line items] |  |  |  |
Current period | [1] | $ 316 | $ 261 | $ 183
Total income tax charge for the year | [2] | 269 | 260 | 164
Pillar Two Tax [Member] |  |  |  |
Income tax [line items] |  |  |  |
Current period |  | 2 | 0 | 0
Before exceptional items [member] | United States [member] |  |  |  |
Income tax [line items] |  |  |  |
Total income tax charge for the year |  | $ 169 | $ 172 | $ 134
[1] | Includes $2m (2023: $nil, 2022: $nil) in respect of taxes arising under the Pillar Two framework.
[2] | ‘Other jurisdictions’ includes $169m (2023: $172m, 2022: $134m) in respect of US taxes.

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