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Cash and cash equivalents - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Cash and cash equivalents [line items] |  |
Bank balances | $ 33 | $ 51
Bank overdrafts | $ 17 | $ 44

X
- Definition Bank balances under cash pooling arrangements. + References No definition available. + Details
Name: | ihg_BankBalancesUnderCashPoolingArrangements
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Bank overdrafts under cash pooling arrangements. + References No definition available. + Details
Name: | ihg_BankOverdraftsUnderCashPoolingArrangements
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash and cash equivalents. + References No definition available. + Details
Name: | ihg_CashAndCashEquivalents1LineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration