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Loans and Other Borrowings - Summary of Facilities Provided by Banks (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of facilities provided by banks [line items] |  |
Utilised facilities | $ 0 | $ 265
Unutilised facilities provided by banks | 1,403 | 1,155
Total | 1,403 | 1,420
Committed [member] |  |
Disclosure of facilities provided by banks [line items] |  |
Utilised facilities | 0 | 264
Unutilised facilities provided by banks | 1,350 | 1,086
Total | 1,350 | 1,350
Uncommitted [member] |  |
Disclosure of facilities provided by banks [line items] |  |
Utilised facilities | 0 | 1
Unutilised facilities provided by banks | 53 | 69
Total | $ 53 | $ 70

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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_50_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of facilities provided by banks. + References No definition available. + Details
Name: | ihg_DisclosureOfFacilitiesProvidedByBanksLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Drawn borrowing facilities. + References No definition available. + Details
Name: | ihg_DrawnBorrowingFacilities
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility Maximum Borrowings Capacity + References No definition available. + Details
Name: | ihg_LineOfCreditFacilityMaximumBorrowingsCapacity
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ihg_CommittedCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |