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Tax - Summary of Reconciliation of Tax Paid to Total Current Tax Charge in Income Statement (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Reconciliation Of Tax Paid [abstract] |
Income tax refund of earlier years | $ 20
Other receivables allocated to payments would have been due | 12
Payments due in 2022 | $ 28

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- Definition Income tax other receivables allocated to payment due. + References No definition available. + Details
Name: | ihg_IncomeTaxOtherReceivablesAllocatedToPaymentDue
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Income tax other receivables allocated to payment due in next twelve months. + References No definition available. + Details
Name: | ihg_IncomeTaxOtherReceivablesAllocatedToPaymentDueInNextTwelveMonths
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reconciliation of tax paid. + References No definition available. + Details
Name: | ihg_ReconciliationOfTaxPaidAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Refund of tax amount. + References No definition available. + Details
Name: | ihg_RefundOfTaxAmount
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration