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v3.20.4

Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
2021 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | $ 33 | $ 31
Unrecognised deferred tax | 8 | 6
2022 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 11 | 10
Unrecognised deferred tax | 3 | 2
2023 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 2 | 2
2024 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 5 | 4
Unrecognised deferred tax | 1 | 1
2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 110 | 91
Unrecognised deferred tax | 26 | 20
2026 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 1 |
2027 [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 3 | 3
Unrecognised deferred tax | 1 | 1
After 2027 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 24 | 21
Unrecognised deferred tax | $ 17 | $ 16

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- Definition Unrecognised deferred tax on tax losses and tax credits. + References No definition available. + Details
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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
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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
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |