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Exceptional items - Summary of Exceptional Items (Parenthetical) (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Disclosure Of Exceptional Items [line items] |  |  |  |
Effective tax rate | 19.25% | 20.00% | 20.25% |
InterContinental New York Barclay [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Percentage of interest disposed |  |  |  | 80.10%
United States [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Effective tax rate | 35.00% |  |  |
United States [member] | Effective 1 January 2018 [Member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Effective tax rate | 21.00% |  |  |
Exceptional items [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Reorganisation costs | $ 36 |  | $ 6 |
Tax credit relating to associate investment impairment | 7 | $ 6 |  |
Tax credit/(charge) relating to other items |  | 1 | 27 |
Current tax credit/(charge) relating to reorganisation cost | 13 |  |  |
Tax charge relating to disposal of hotels |  |  | (56) |
Tax credit relating to integration costs | 6 | $ 5 |  |
Tax credit/(charge) relating to disposal of investment in associate |  |  | $ 21 |
Exceptional items [member] | United States [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Income tax expense | 108 |  |  |
Current tax charge | 32 |  |  |
Deferred tax | 140 |  |  |
Tax credit arising from release of a contingency no longer required due to statute of limitations expiry | 10 |  |  |
Exceptional items [member] | Consultancy expense [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Reorganisation costs | 24 |  |  |
Exceptional items [member] | Severance Costs [Member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Reorganisation costs | 8 |  |  |
System Fund reorganisation costs [Member] | Exceptional items [member] |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Reorganisation costs | $ 9 |  |  |
Venezuelan bolívar fuerte |  |  |  |
Disclosure Of Exceptional Items [line items] |  |  |  |
Adoption of SICAD II exchange rate versus USD |  |  | 190 |

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