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Segmental Information - Summary of Information by Reportable Segment - Other Segmental Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 110 | $ 116 | $ 115
Share-based payments cost | 19 | 28 | 27
Share of losses/(gains) of associates and joint ventures | 14 | 3 | 1
Americas [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 41 | 44 | 46
Share-based payments cost | 7 | 9 | 8
Share of losses/(gains) of associates and joint ventures | 14 | 9 | 6
EMEAA [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 21 | 25 | 17
Share-based payments cost | 3 | 4 | 4
Share of losses/(gains) of associates and joint ventures |  | (6) | (5)
Greater China [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 6 | 5 | 7
Share-based payments cost | 2 | 2 | 3
Central [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 42 | 42 | 45
Share-based payments cost | $ 7 | $ 13 | $ 12

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