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Provisions - Summary of Amounts Arising from Insurance Contracts (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of other provisions [line items] |  |
Incurred but not reported claims | $ 36 | $ 30
Reported but not yet settled claims | 14 | 9
Total | 50 | 39
Corporate Operations and Owned and Leased Properties [Member] |  |
Disclosure of other provisions [line items] |  |
Incurred but not reported claims | 11 | 11
Reported but not yet settled claims | 7 | 3
Total | 18 | 14
Managed Hotels [Member] |  |
Disclosure of other provisions [line items] |  |
Incurred but not reported claims | 25 | 19
Reported but not yet settled claims | 7 | 6
Total | $ 32 | $ 25

X
- Definition The amount of liability for insured events that have occurred but for which claims have yet not been reported by policyholders. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph IG22 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_IG22_c&doctype=Implementation%20Guidance&book=b -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The amount of insurance contracts that are liabilities. [Refer: Liabilities; Insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2023-01-01 -Name IFRS -Number 17 -IssueDate 2022-03-24 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2022-en-r&anchor=para_99_b&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Settled claims but not reported. + References No definition available. + Details
Name: | ihg_SettledClaimsButNotReported
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ihg_InsuranceReserveAxis=ihg_ManagedHotelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |