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Other Financial Assets - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 USD ($)
Disclosure of financial assets [line items] |  |  |  |
Proceeds from sale of interest in equity security available-for-sale | $ 75 |  |  |
Bank accounts pledged as security | £ |  |  | £ 31 |
Avendra LLC [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Proceeds from sale of interest in equity security available-for-sale | $ 75 |  |  |
Percentage interest in equity security available-for-sale | 6.29% |  |  |
Gain on disposal of equity securities available-for-sale | $ 73 |  |  |
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 |  | $ 66 |  | $ 66
Discounted value of material deposit made to a hotel owner in connection with a portfolio of management contracts |  | $ 32 |  | $ 30

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