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Tax - Deferred Tax - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 126 | $ 147 |
Uncertain tax positions current liability | 9 | 24 |
Deferred tax asset recognised in respect of revenue losses | 102 | 114 |
Deferred tax assets recognized related to legal entities which suffered tax loss | 107 | 120 |
Deferred tax assets liabilities net threshold | 10 | 10 |
Adjustments for current tax of prior periods | (7) | 4 | $ (7)
Internal Revenue Service [Member] | Tax Uncertainties [Member] | Two Thousand And Fourteen [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Adjustments for current tax of prior periods | 5 |  |
Interest expense on income tax | 3 |  |
Surplus Tax Provision Relased | 4 |  |
Top of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Uncertain tax positions current liability | 3 | 10 |
United Kingdom [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 109 | 127 |
Deferred Tax Asset Offset Percentage On Annual Profits (50% restriction on deferred tax losses) | 50.00% |  |
Deferred Tax Assets Recognized Related To Profitable Legal Entities | $ 7 | 13 |
Deferred Tax Assets Relating To Revenue Losses | 73 | 73 |
Adjustments for current tax of prior periods | (2) |  | $ (2)
United Kingdom [member] | Her Majesty Revenue And Customers [Member] | Tax Uncertainties [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Uncertain tax positions current liability | 0 | 2 |
Adjustments for current tax of prior periods | $ 0 | $ 2 |
United Kingdom [member] | Bottom of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred Tax Asset Reverse Period | 7 years | 7 years |
United Kingdom [member] | Top of range [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred Tax Asset Reverse Period | 10 years | 10 years |
UNITED STATES | Internal Revenue Service [Member] | Tax Uncertainties [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Uncertain tax positions current liability | $ 3 | $ 13 |
Unprovided deferred tax on unremitted earnings [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Unremitted earnings on which no deferred tax provided | $ 500 | $ 400 |

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