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Contingencies and guarantees - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of contingent liabilities [line items] |  |
Outstanding letters of credit | $ 45 | $ 43
Guarantees of loans made to equity accounted investments | 69 | $ 56
Maximum [member] |  |
Disclosure of contingent liabilities [line items] |  |
Guarantees of loans made to equity accounted investments | $ 21 |

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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_
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- Definition The amount of guarantees of loans made to equity accounted investments. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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