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Financial risk management and derivatives - Summary of information about collateral held as security (Detail) $ in Millions | Dec. 31, 2018 USD ($)
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Disclosure of collateral held as security for assets [line items] |
2018 | $ 268
Government bonds [member] |
Disclosure of collateral held as security for assets [line items] |
2018 | 60
Supranational bonds [member] |
Disclosure of collateral held as security for assets [line items] |
2018 | 208
AAA credit rating [member] |
Disclosure of collateral held as security for assets [line items] |
2018 | 207
AA credit rating [member] |
Disclosure of collateral held as security for assets [line items] |
2018 | 34
AA Minus Credit Rating [member] |
Disclosure of collateral held as security for assets [line items] |
2018 | $ 27

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- Definition The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of collateral held as security for assets [line items] + References No definition available. + Details
Name: | ihg_DisclosureOfCollateralHeldAsSecurityForAssetsLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ExternalCreditGradesAxis=ihg_GovernmentBondsMember
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Data Type: | na
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- Details
Name: | ifrs-full_ExternalCreditGradesAxis=ihg_SupranationalBondsMember
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Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_ExternalCreditGradesAxis=ihg_AAACreditRatingMember
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Data Type: | na
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- Details
Name: | ifrs-full_ExternalCreditGradesAxis=ihg_AACreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_ExternalCreditGradesAxis=ihg_AaMinusCreditRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |