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Leases - Disclosure of quantitative information about right-of-use assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lease Assets Cost |  |  |
Beginning balance | $ 827 | $ 797 |
Additions and other re-measurements | 13 | 40 |
Acquisition of businesses (note 11) |  | 25 |
Derecognition | (93) |  |
Transfers to assets classified as held for sale (note 12) |  | (23) |
Terminations | (127) | (16) |
Exchange and other adjustments | 1 | 4 |
Ending balance | 621 | 827 | $ 797
Depreciation and impairment |  |  |
Beginning balance | (337) | (284) |
Provided | (35) | (38) |
System Fund expense | (4) | (5) | (4)
Impairment Charge | (16) | (32) |
System Fund impairment charge | (32) |  |
Transfers to assets classified as held for sale (note 12) |  | 8 |
Derecognition | 44 |  |
Terminations | 65 | 15 |
Exchange and other adjustments | (3) | (1) |
Ending balance | (318) | (337) | (284)
Net book value |  |  |
Right-of-use assets net | 303 | 490 | 513
Property [member] |  |  |
Lease Assets Cost |  |  |
Beginning balance | 822 | 792 |
Additions and other re-measurements | 12 | 39 |
Acquisition of businesses (note 11) |  | 25 |
Derecognition | (93) |  |
Transfers to assets classified as held for sale (note 12) |  | (23) |
Terminations | (125) | (15) |
Exchange and other adjustments | 1 | 4 |
Ending balance | 617 | 822 | 792
Depreciation and impairment |  |  |
Beginning balance | (335) | (282) |
Provided | (34) | (37) |
System Fund expense | (4) | (5) |
Impairment Charge | (16) | (32) |
System Fund impairment charge | (32) |  |
Transfers to assets classified as held for sale (note 12) |  | 8 |
Derecognition | 44 |  |
Terminations | 64 | 14 |
Exchange and other adjustments | (3) | (1) |
Ending balance | (316) | (335) | (282)
Net book value |  |  |
Right-of-use assets net | 301 | 487 | 510
Other [member] |  |  |
Lease Assets Cost |  |  |
Beginning balance | 5 | 5 |
Additions and other re-measurements | 1 | 1 |
Terminations | (2) | (1) |
Ending balance | 4 | 5 | 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 | $ 2 | $ 3 | $ 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 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Acquisitions through business combination right of use assets leases. + References No definition available. + Details
Name: | ihg_AcquisitionsThroughBusinessCombinationRightOfUseAssetsLeases
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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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
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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
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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
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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
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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 Rights of use assets non current assets classified as held for sale. + References No definition available. + Details
Name: | ihg_RightsOfUseAssetsNonCurrentAssetsClassifiedAsHeldForSale
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rights Of Use Assets Non Current Assets Classified As Held For Sale Accumulated Depreciation And Impairment + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Termination of right of use assets,leases. + References No definition available. + Details
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |