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Share-based payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Vesting period of share awards |  | 3 years |
Weighted average share price at exercise date | $ 8,225.7 | $ 5,470.3 | $ 4,950.5
Liabilities from share-based payment transactions | $ 0 | $ 0 | $ 0
Maximum [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
IHG share price | $ 10,180 | $ 7,118 | $ 5,338
Minimum [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
IHG share price | 7,016 | 4,832 | 4,193
Closing [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
IHG share price | $ 9,954 | $ 7,090 | $ 4,744

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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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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Types of share-based payment arrangements [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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Period Type: | instant

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- Definition The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Price Per Share + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Typical vesting period of LTIP and RSU share awards. + References No definition available. + Details
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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |