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Revenue - Movements in Contract Costs, Typically Developer Commissions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract] |  |
Contract costs beginning balance | $ 87 | $ 80
Costs incurred | 18 | 15
Charged to income statement | (8) | (8)
Exchange and other adjustments | (2) |
Contract costs ending balance | 95 | 87
Contract costs disclosed as: |  |
Current | 5 | 5
Non-current | 90 | 82
Total contract costs | $ 95 | $ 87

X
- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 128 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_128_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_ContractAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition IFRS current Assets recognised from costs to obtain or fulfill contracts with customers. + References No definition available. + Details
Name: | ihg_ContractCostsCurrent
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition IFRS non-current Assets recognised from costs to obtain or fulfill contracts with customers. + References No definition available. + Details
Name: | ihg_ContractCostsNoncurrent
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Costs incurred to obtain or fulfill contracts with customers. + References No definition available. + Details
Name: | ihg_CostsIncurredToObtainOrFulfilContractsWithCustomers
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred to obtain or fulfil contracts with customers charged to income statement. + References No definition available. + Details
Name: | ihg_CostsIncurredToObtainOrFulfilContractsWithCustomersChargedToIncomeStatement
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs incurred to obtain or fulfil contracts with customers exchange and other. + References No definition available. + Details
Name: | ihg_CostsIncurredToObtainOrFulfilContractsWithCustomersExchangeAndOther
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration