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System Fund - Summary of Liabilities Relating to Fund (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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System Fund [abstract] |  |
Loyalty programme liability, current | $ 343 | $ 291
Loyalty programme liability, non-current | $ 417 | $ 394

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- Definition Loyalty programme liability current. + References No definition available. + Details
Name: | ihg_LoyaltyProgrammeLiabilityCurrent
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Loyalty programme liability non-current. + References No definition available. + Details
Name: | ihg_LoyaltyProgrammeLiabilityNoncurrent
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition System Fund [abstract] + References No definition available. + Details
Name: | ihg_SystemFundAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration