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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 110 | $ 116 | $ 115
Administrative expenses [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 29 | 32 | 27
Cost of sales [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | 81 | 84 | 88
System Fund [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Depreciation and amortisation | $ 62 | $ 54 | $ 49

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