Tax - Summary of Reconciliation of Tax Paid to Total Current Tax Charge in Income Statement (Parenthetical) (Detail) $ in Millions	12 Months Ended
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

Income tax other receivables allocated to payment due in next twelve months.

No definition available.

Name:	ihg_IncomeTaxOtherReceivablesAllocatedToPaymentDueInNextTwelveMonths
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant