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Other financial assets - Schedule of Movement in the Allowance For Expected Lifetime Credit Losses (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of financial assets [abstract] |  |
At 1 January | $ (15) | $ (15)
Amounts Written Off | 2 | 0
Exchange and other adjustments | 1 | 0
At 31 December | $ (12) | $ (15)

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- References No definition available. + Details
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Period Type: | duration

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- Definition The increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Allowance account for credit losses of financial asset. + References No definition available. + Details
Name: | ihg_AllowanceAccountForCreditLossesOfFinancialAsset
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amounts written off other financial assets. + References No definition available. + Details
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Balance Type: | debit
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