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Segmental Information - Summary of Information by Reportable Segment - Other Segmental Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of reportable segments [line items] |  |  |  |  |
Depreciation and amortisation | $ 67 | $ 68 | [1] | $ 98 | [1]
Contract assets deduction in revenue | 37 | 32 |  | 35 |
Equity-settled share-based payments cost | 31 | 28 |  | 26 |
Share of profit /losses of associates and joint ventures | (31) | 59 | [1] | 8 | [1]
Excluding exceptional items [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Share of profit /losses of associates and joint ventures | (13) | (1) |  | 8 |
Americas [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Depreciation and amortisation | 24 | 23 |  | 30 |
Contract assets deduction in revenue | 21 | 18 |  | 17 |
Equity-settled share-based payments cost | 9 | 8 |  | 8 |
Share of profit /losses of associates and joint ventures |  |  |  | 7 |
Americas [member] | Excluding exceptional items [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Share of profit /losses of associates and joint ventures | (5) | (1) |  |  |
EMEAA [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Depreciation and amortisation | 12 | 13 |  | 18 |
Contract assets deduction in revenue | 15 | 13 |  | 17 |
Equity-settled share-based payments cost | 4 | 4 |  | 4 |
Share of profit /losses of associates and joint ventures |  |  |  | 1 |
EMEAA [member] | Excluding exceptional items [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Share of profit /losses of associates and joint ventures | (8) |  |  |  |
Greater China [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Depreciation and amortisation | 4 | 4 |  | 6 |
Contract assets deduction in revenue | 1 | 1 |  | 1 |
Equity-settled share-based payments cost | 2 | 2 |  | 3 |
Central [member] |  |  |  |  |
Disclosure of reportable segments [line items] |  |  |  |  |
Depreciation and amortisation | 27 | 28 |  | 44 |
Equity-settled share-based payments cost | $ 16 | $ 14 |  | $ 11 |
[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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