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Segmental Information - Summary of Information by Reportable Segment - Other Segmental Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 65 | $ 67 | $ 68
Contract assets deduction in revenue | 43 | 37 | 32
Equity-settled share-based payments cost | 37 | 31 | 28
Share of profit of associates and joint ventures | (10) | (31) | 59
Excluding exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Share of profit of associates and joint ventures | (10) | (13) | (1)
Americas [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 24 | 24 | 23
Contract assets deduction in revenue | 24 | 21 | 18
Equity-settled share-based payments cost | 10 | 9 | 8
Share of profit of associates and joint ventures | (4) |  |
Americas [member] | Excluding exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Share of profit of associates and joint ventures |  | (5) | (1)
EMEAA [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 12 | 12 | 13
Contract assets deduction in revenue | 18 | 15 | 13
Equity-settled share-based payments cost | 5 | 4 | 4
Share of profit of associates and joint ventures | (6) |  |
EMEAA [member] | Excluding exceptional items [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Share of profit of associates and joint ventures |  | (8) |
Greater China [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 3 | 4 | 4
Contract assets deduction in revenue | 1 | 1 | 1
Equity-settled share-based payments cost | 3 | 2 | 2
Share of profit of associates and joint ventures | 0 |  |
Central [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 26 | 27 | 28
Contract assets deduction in revenue | 0 |  |
Equity-settled share-based payments cost | 19 | $ 16 | $ 14
Share of profit of associates and joint ventures | $ 0 |  |

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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_e&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard -URIDate 2024-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_104&doctype=Standard -URIDate 2024-03-27 + Details
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