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Segmental Information - Summary of Information by Reportable Segment - Other Segmental Information (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 116 | $ 115 | $ 112
Americas Region [Member] | Reportable segments [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Proceeds from business interruption | 10 |  |
Administrative expenses [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 82 | 86 | 78
Cost of sales [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 34 | 29 | 34
System Fund [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 54 | $ 49 | $ 41

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