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Related party disclosures - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of transactions between related parties [Line Items] |  |
Outstanding commitments made by entity, related party transactions | $ 4 | $ 6
Associates [member] | Investment in preferred shares of associates [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Amounts receivable, related party transactions | 43 |
Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities | 34 | 12
Barclay associate [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Loan to and from material associate investment (offset in accordance with IAS32) | $ 237 | $ 237
Average interest rate on interest payable and receivable relating to loan to and from material associate investment | 4.10% | 4.00%

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- Definition The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_18_b&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Balance Type: | na
Period Type: | duration

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- Definition The cash outflow to acquire equity or debt instruments of other entities (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_c&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of outstanding commitments made by the entity in related party transactions. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_18_b&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Interest payable (receivable) equivalent average rate. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans both payable and receivable offset net. + References No definition available. + Details
Name: | ihg_LoansBothPayableAndReceivableOffsetNet
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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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: |