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Segmental Information - Summary of Information by Reportable Segment - Other Segmental Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reportable segments [line items] |  |  |
Capital expenditure | $ 243 | $ 336 | $ 238
Depreciation and amortisation | 80 | 78 | 75
Share-based payments cost | 27 | 21 | 17
Share of losses/(gains) of associates and joint ventures | 1 | (3) | 2
Impairment charges | 0 | 18 | 16
Americas [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure | 74 | 120 | 67
Depreciation and amortisation | 27 | 23 | 21
Share-based payments cost | 8 | 6 | 6
Share of losses/(gains) of associates and joint ventures | 6 | 1 | 7
Impairment charges |  | 18 | 16
EMEAA [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure | 33 | 26 | 22
Depreciation and amortisation | 8 | 7 | 7
Share-based payments cost | 4 | 4 | 4
Share of losses/(gains) of associates and joint ventures | (5) | (4) | (5)
Greater China [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure | 2 | 2 | 1
Depreciation and amortisation | 3 | 1 | 1
Share-based payments cost | 3 | 3 | 3
Share of losses/(gains) of associates and joint ventures | 0 |  |
Central [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Capital expenditure | 134 | 188 | 148
Depreciation and amortisation | 42 | 47 | 46
Share-based payments cost | 12 | $ 8 | $ 4
Share of losses/(gains) of associates and joint ventures | $ 0 |  |

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