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Other Financial Assets - Additional Information (Detail) £ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Other financial assets | $ 169 |  | $ 288
Other Financial Asset [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | $ 66 |  | 136
Trade deposits and loans [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Material deposit made to a hotel owner in connection with a portfolio of management contracts |  |  | $ 33
United Kingdom [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Bank accounts pledged as security | £ |  | £ 31 |

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- Definition Material deposit made to a hotel owner in connection with a portfolio of management contracts. + References No definition available. + Details
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