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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
2024 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | $ 0 | $ 6
Unrecognised deferred tax | 0 | 1
2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 11 | 11
Unrecognised deferred tax | 2 | 2
2026 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 7 | 7
Unrecognised deferred tax | 1 | 1
2027 [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 7 | 7
Unrecognised deferred tax | 1 | 1
2028 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 0 | 6
Unrecognised deferred tax | 0 | 1
2029 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 10 | 10
Unrecognised deferred tax | 10 | 10
After 2031 [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 36 | 22
Unrecognised deferred tax | $ 36 | $ 22

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- Definition Unrecognised deferred tax on tax losses and tax credits. + References No definition available. + Details
Name: | ihg_UnrecognisedDeferredTaxOnTaxLossesAndTaxCredits
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent unrecognised deferred tax position. + References No definition available. + Details
Name: | ihg_UnrecognisedDeferredTaxPositionLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unused tax losses and tax credits for which no deferred tax asset recognised. + References No definition available. + Details
Name: | ihg_UnusedTaxLossesAndTaxCreditsForWhichNoDeferredTaxAssetRecognised
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_TwoThousandTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ihg_AfterTwoThousandThirtyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |