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Leases - Disclosure of quantitative information about right-of-use assets (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Lease Assets Cost |  |  |  |
Beginning balance | $ 621 | $ 827 |  |
Additions and other re-measurements | 4 | 13 |  |
Derecognition |  | (93) |  |
Terminations | (7) | (127) |  |
Disposals | (3) |  |  |
Exchange and other adjustments | (5) | 1 |  |
Ending balance | 610 | 621 | $ 827 |
Depreciation and impairment |  |  |  |
Beginning balance | (318) | (337) |  |
Provided | (27) | (35) |  |
System Fund expense | (3) | (4) | (5) |
Impairment Charge |  | (16) | (32) |
System Fund impairment charge |  | (32) |  |
Derecognition |  | 44 |  |
System Fund impairment reversal | 3 |  |  |
Terminations | 5 | 65 |  |
Disposals | 1 |  |  |
Exchange and other adjustments | 3 | (3) |  |
Ending balance | (336) | (318) | (337) |
Net book value |  |  |  |
Right-of-use assets net | 274 | 303 |  | $ 490
Property [member] |  |  |  |
Lease Assets Cost |  |  |  |
Beginning balance | 617 | 822 |  |
Additions and other re-measurements | 4 | 12 |  |
Derecognition |  | (93) |  |
Terminations | (6) | (125) |  |
Disposals | (3) |  |  |
Exchange and other adjustments | (5) | 1 |  |
Ending balance | 607 | 617 | 822 |
Depreciation and impairment |  |  |  |
Beginning balance | (316) | (335) |  |
Provided | (26) | (34) |  |
System Fund expense | (3) | (4) |  |
Impairment Charge |  | (16) |  |
System Fund impairment charge |  | (32) |  |
Derecognition |  | 44 |  |
System Fund impairment reversal | 3 |  |  |
Terminations | 4 | 64 |  |
Disposals | 1 |  |  |
Exchange and other adjustments | 3 | (3) |  |
Ending balance | (334) | (316) | (335) |
Net book value |  |  |  |
Right-of-use assets net | 273 | 301 |  | 487
Other [member] |  |  |  |
Lease Assets Cost |  |  |  |
Beginning balance | 4 | 5 |  |
Additions and other re-measurements |  | 1 |  |
Terminations | (1) | (2) |  |
Ending balance | 3 | 4 | 5 |
Depreciation and impairment |  |  |  |
Beginning balance | (2) | (2) |  |
Provided | (1) | (1) |  |
Terminations | 1 | 1 |  |
Ending balance | (2) | (2) | $ (2) |
Net book value |  |  |  |
Right-of-use assets net | $ 1 | $ 2 |  | $ 3

X
- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additions and other remeasurements right of use assets. + References No definition available. + Details
Name: | ihg_AdditionsAndOtherRemeasurementsRightOfUseAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Depreciation right of use assets charged to the system fund. + References No definition available. + Details
Name: | ihg_DepreciationRightOfUseAssetsChargedToTheSystemFund
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Derecognition of right of use assets. + References No definition available. + Details
Name: | ihg_DerecognitionOfRightOfUseAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Derecognition of Right of Use Assets Accumulated Depreciation And Impairment + References No definition available. + Details
Name: | ihg_DerecognitionOfRightOfUseAssetsAccumulatedDepreciationAndImpairment
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disposals of right to use assets. + References No definition available. + Details
Name: | ihg_DisposalsOfRightToUseAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disposals of right to use assets depreciation and impairment. + References No definition available. + Details
Name: | ihg_DisposalsOfRightToUseAssetsDepreciationAndImpairment
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Exchange and other adjustments right of use assets at cost operating leases. + References No definition available. + Details
Name: | ihg_ExchangeAndOtherAdjustmentsRightOfUseAssetsAtCostOperatingLeases
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Exchange and other adjustments right of use assets operating leases accumulated depreciation and impairment. + References No definition available. + Details
Name: | ihg_ExchangeAndOtherAdjustmentsRightOfUseAssetsOperatingLeasesAccumulatedDepreciationAndImpairment
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment charges. + References No definition available. + Details
Name: | ihg_ImpairmentCharges
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease assets cost. + References No definition available. + Details
Name: | ihg_LeaseAssetsCostAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease right of use assets accumulated depreciation and impairment. + References No definition available. + Details
Name: | ihg_LeaseRightOfUseAssetsAccumulatedDepreciationAndImpairment
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease right of use assets accumulated depreciation and impairment terminations. + References No definition available. + Details
Name: | ihg_LeaseRightOfUseAssetsAccumulatedDepreciationAndImpairmentTerminations
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease Right Of Use Assets Depreciation And Impairment + References No definition available. + Details
Name: | ihg_LeaseRightOfUseAssetsDepreciationAndImpairmentAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease right of use assets depreciation and impairment during the period. + References No definition available. + Details
Name: | ihg_LeaseRightOfUseAssetsDepreciationAndImpairmentDuringThePeriod
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease Right Of Use Assets System Fund Impairment Charge + References No definition available. + Details
Name: | ihg_LeaseRightOfUseAssetsSystemFundImpairmentCharge
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease of right of use assets cost. + References No definition available. + Details
Name: | ihg_LeaseofRightofuseAssetsCost
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Right Of Use AssetsBok Value + References No definition available. + Details
Name: | ihg_RightOfUseAssetsbokValueAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition System fund impairment reversal. + References No definition available. + Details
Name: | ihg_SystemFundImpairmentReversal
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Termination of right of use assets,leases. + References No definition available. + Details
Name: | ihg_TerminationOfRightOfUseAssetsleasescost
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_PropertyPlantAndEquipmentByOperatingLeaseStatusAxis=ifrs-full_PropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PropertyPlantAndEquipmentByOperatingLeaseStatusAxis=ifrs-full_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |