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Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | $ 66 | $ 48
Group income statement | 47 | 13
Group statement of comprehensive income | (16) | (11)
Group statement of changes in equity | 9 | 6
Exchange and other adjustments | (2) | 10
Ending balance | 104 | 66
Deferred gains on loan notes [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (34) | (34)
Group income statement | 0 | 0
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 |
Ending balance | (34) | (34)
Associates [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (60) | (59)
Group income statement | 1 | (1)
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 |
Ending balance | (59) | (60)
Losses [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 76 | 79
Group income statement | (7) | 0
Group statement of comprehensive income | (3) | (6)
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | (1) | 3
Ending balance | 65 | 76
Employee benefits [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 95 | 84
Group income statement | 9 | 4
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 9 | 6
Exchange and other adjustments | 0 | 1
Ending balance | 113 | 95
Deferred compensation [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 0 | 0
Group income statement | 30 | 0
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 |
Ending balance | 30 | 0
Other short-term temporary differences [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 8 | 22
Group income statement | (11) | (11)
Group statement of comprehensive income | (13) | (5)
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | (1) | 2
Ending balance | (17) | 8
Research and development [Member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 15 | 8
Group income statement | 18 | 7
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 | 0
Ending balance | 33 | 15
Property, plant, equipment and software [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (30) | (53)
Group income statement | 21 | 22
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 | 1
Ending balance | (9) | (30)
Application Fees [Member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 42 | 41
Group income statement | 0 | 1
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 |
Ending balance | 42 | 42
Intangible Assets Excluding Software [Member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (46) | (40)
Group income statement | (14) | (9)
Group statement of comprehensive income | 0 | 0
Group statement of changes in equity | 0 | 0
Exchange and other adjustments | 0 | 3
Ending balance | $ (60) | $ (46)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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