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Staff costs and Directors' remuneration - Summary of Director's Emoluments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Director [member] |  |  |
Disclosure of Directors Emoluments [Line Items] |  |  |
Base salaries, fees, performance payments and benefits | $ 4.2 | $ 6.4 | $ 7.1

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- Definition The amount of remuneration paid or payable to the entity's directors. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of Director's emoluments. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ihg_KeyManagementPersonnelAxis=ihg_Director2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |