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Tax - Summary of Tax on (Loss)/Profit (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income tax [line items] |  |  |  |  |
Current period | $ 261 | $ 183 |  | $ 139 |
Adjustments in respect of prior periods | 12 | (7) |  | 4 |
Current tax | 273 | 176 |  | 143 |
Origination and reversal of temporary differences | (20) | (7) |  | (21) |
Changes in tax rates and tax laws | 2 | 0 |  | (25) |
Adjustments to unprovided or unrecognised deferred tax | 5 | (2) |  | 2 |
Adjustments in respect of prior periods | 0 | (3) |  | (3) |
Deferred tax | (13) | (12) |  | (47) |
Income tax charge/(credit) for the year | 260 | 164 | [1] | 96 | [1]
United Kingdom [member] |  |  |  |  |
Income tax [line items] |  |  |  |  |
Current period | 16 | 6 |  | 1 |
Adjustments in respect of prior periods | 0 | (2) |  |  |
Current tax | 16 | 4 |  | 1 |
Origination and reversal of temporary differences | 1 | (1) |  | (7) |
Changes in tax rates and tax laws | 0 | 0 |  | (25) |
Adjustments to unprovided or unrecognised deferred tax | 0 | (2) |  | 2 |
Adjustments in respect of prior periods | 1 | 2 |  | 1 |
Deferred tax | 2 | (1) |  | (29) |
Income tax charge/(credit) for the year | 18 | 3 |  | (28) |
Foreign tax [member] |  |  |  |  |
Income tax [line items] |  |  |  |  |
Current period | 245 | 177 |  | 138 |
Adjustments in respect of prior periods | 12 | (5) |  | 4 |
Current tax | 257 | 172 |  | 142 |
Origination and reversal of temporary differences | (21) | (6) |  | (14) |
Changes in tax rates and tax laws | 2 | 0 |  |  |
Adjustments to unprovided or unrecognised deferred tax | 5 | 0 |  |  |
Adjustments in respect of prior periods | (1) | (5) |  | (4) |
Deferred tax | (15) | (11) |  | (18) |
Income tax charge/(credit) for the year | $ 242 | $ 161 |  | $ 124 |
[1] | 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).

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