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Share-based payments - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) £ / shares	Dec. 31, 2024 USD ($) £ / shares	Dec. 31, 2023 USD ($) £ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Vesting period of share awards	3 years
Holding period after vesting of share awards	2 years
Liabilities from share-based payment transactions | $	$ 0	$ 0	$ 0
Weighted average share price at exercise date (in dollar per share)	$ 99.636	$ 82.257	$ 57.403
Closing
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
IHG share price (in dollar per share)	104.60	99.54	70.90
Minimum
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
IHG share price (in dollar per share)	74.24	70.16	48.32
Maximum
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
IHG share price (in dollar per share)	$ 108.80	$ 101.80	$ 71.18

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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.

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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 2025-01-01
-Paragraph 51
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_51_b_i&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 34
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_34_b&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 34
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_34_b&doctype=Standard
-URIDate 2025-03-27

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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 2025-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard
-URIDate 2025-03-27

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- Definition

Price Per Share

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Typical vesting period of LTIP and RSU share awards.

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