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Other Financial Assets - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 GBP (£)
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | $ 116 | $ 127 |
Proceeds from sale of interest in equity security available-for-sale | 0 | 75 |
Financial assets measured at amortised cost | 145 | 117 |
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 | 30 | 28 |
Financial assets measured at amortised cost | 50 | 43 |
Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets measured at amortised cost | 55 | 32 |
Restricted funds [member] | Barclay associate [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets measured at amortised cost | 25 |  |
US dollars [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | 91 | 93 |
Hong Kong dollars [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | 16 | 25 |
Other currencies [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | $ 9 | $ 9 |

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