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Exceptional items - Summary of Tax Impacts On Exceptional Items (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | $ 273 | $ 176 |  | $ 143 |
Deferred tax expense | (13) | (12) |  | (47) |
Total current and deferred tax | 260 | 164 | [1] | 96 | [1]
Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | (3) | 33 |  | (2) |
Deferred tax expense | (4) | (7) |  | 5 |
Total current and deferred tax | (7) | 26 |  | 3 |
Costs of ceasing operations in Russia [Member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense |  | 3 |  |  |
Commercial litigation and disputes [Member] | Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | 0 | 8 |  | 0 |
Deferred tax expense | 0 | (2) |  | 4 |
Share of (profits)/losses of associate [Member] | Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | 0 | 15 |  | 0 |
Deferred tax expense | (4) | 0 |  | 0 |
Other operating income [Member] | Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | (3) |  |  |  |
Other net impairment reversals/(charges) [Member] | Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | 0 | 1 |  | 0 |
Deferred tax expense | 0 | (5) |  | 1 |
Adjustments in respect of prior years [Member] | Exceptional Items [member] |  |  |  |  |
Disclosure of tax impacts on exceptional items [Line Items] |  |  |  |  |
Current tax expense | 0 | 6 |  | (2) |
Deferred tax expense | $ 0 | $ 0 |  | $ 0 |
[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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