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Other financial assets - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 GBP (£)
Disclosure of financial assets [Line Items] |  |  |
Equity securities available-for-sale | $ 127 | $ 156 |
Dividend income on available-for-sale financial assets | 10 | 7 |
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 |  |
Discounted value of material deposit made to a hotel owner in connection with a portfolio of management contracts | 28 | 19 |
US dollars [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Equity securities available-for-sale | 93 | 121 |
Hong Kong, Dollars |  |  |
Disclosure of financial assets [Line Items] |  |  |
Equity securities available-for-sale | 25 | 24 |
Other currencies [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Equity securities available-for-sale | $ 9 | $ 11 |

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