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Trade and other receivables - Summary of Movement in Allowance for Expected Lifetime Credit Losses of Trade and Other Receivables (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Statement [Line Items] |  |
Reclassification To Other Receivable | $ 9 |
Net receivables relating to finance charges | $ 1 |
Exceptional Items [member] |  |
Statement [Line Items] |  |
Impairment Gain On Financial Assets |  | $ 4

X
- Definition Impairment gain on financial assets. + References No definition available. + Details
Name: | ihg_ImpairmentGainOnFinancialAssets
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net receivables relating to finance charges. + References No definition available. + Details
Name: | ihg_NetReceivablesRelatingToFinanceCharges
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reclassification to other receivable. + References No definition available. + Details
Name: | ihg_ReclassificationToOtherReceivable
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Statement [Line Items] + References No definition available. + Details
Name: | ihg_StatementLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ihg_IncomeStatementLocationAxis=ihg_ExceptionalItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |