The decrease in property, plant and equipment through classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Property, plant and equipment; Disposal groups classified as held for sale [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2021-01-01
-Paragraph 73
-Subparagraph e
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_ii&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_DecreaseThroughClassifiedAsHeldForSalePropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_OtherOperatingIncomeExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_ProceedsFromDisposalOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleAndDiscontinuedOperations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Decrease through classified as held for sale lease liabilities.

+ References

No definition available.

+ Details

Name:	ihg_DecreaseThroughClassifiedAsHeldForSaleLeaseLiabilities
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disclosure Of Assets And Liabilitites Classified As Held For Sale

+ References

No definition available.

+ Details

Name:	ihg_DisclosureOfAssetsAndLiabilititesClassifiedAsHeldForSaleLineItems
Namespace Prefix:	ihg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Net Assets held for sale disposed off consideration receivable.

+ References

No definition available.

+ Details

Name:	ihg_NetAssetsHeldForSaleDisposedOffConsiderationReceivable
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Net cash inflow through classified as held for sale.

+ References

No definition available.

+ Details

Name:	ihg_NetCashInflowThroughClassifiedAsHeldForSale
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Non current assets disposed.

+ References

No definition available.

+ Details

Name:	ihg_NonCurrentAssetsDisposed
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	ifrs-full_GeographicalAreasAxis=ihg_EMEAAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ihg_DisposalGroupsClassifiedAsHeldForSaleAxis=ihg_HolidayInnMelbourneAirportMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Assets and liabilities sold - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets and liabilities classified as held for sale [line items]
Gain on Disposal of Assets and Liabilities Classified as Held For Sale	$ 11	$ 16	$ 21
Proceeds From Disposal Of Noncurrent Assets	44	1
EMEAA [member]
Assets and liabilities classified as held for sale [line items]
Gain on Disposal of Assets and Liabilities Classified as Held For Sale		3
United States [member]
Assets and liabilities classified as held for sale [line items]
Gain on Disposal of Assets and Liabilities Classified as Held For Sale	0
Proceeds From Disposal Of Noncurrent Assets	46
Noncurrent assets disposed	2
Net assets held for sale disposed off consideration payable	44
Decrease through classified as held for sale property plant and equipment	45
Decrease through classified as held for sale lease liabilities	3
Net cash inflow through classified as held for sale	$ 44
Holiday Inn Melbourne Airport [member] \| EMEAA [member]
Assets and liabilities classified as held for sale [line items]
Gain on Disposal of Assets and Liabilities Classified as Held For Sale		(3)
Proceeds From Disposal Of Noncurrent Assets		$ 2