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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
2021 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | $ 0 | $ 33
Unrecognised deferred tax | 0 | 8
2022 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 10 | 11
Unrecognised deferred tax | 3 | 3
2023 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 2 | 2
Unrecognised deferred tax | 0 | 0
2024 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 4 | 5
Unrecognised deferred tax | 1 | 1
2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 100 | 110
Unrecognised deferred tax | 25 | 26
2026 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 13 | 1
Unrecognised deferred tax | 2 | 0
2027 [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 0 | 3
Unrecognised deferred tax | 0 | 1
2028 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 6 | 7
Unrecognised deferred tax | 2 | 2
After 2028 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 12 | 17
Unrecognised deferred tax | $ 11 | $ 15

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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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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_AfterTwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |