XML 444 R170.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Reconciliation of profit for the year to cash flow from operations before contract acquisition costs - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of profit (loss) to net cash flows from operating activities [Line Items] |  |  |
Adjustment For Increase Decrease In Deferred Income | $ 214 | $ 123 | $ 108
Co branding [Member] |  |  |
Reconciliation of profit (loss) to net cash flows from operating activities [Line Items] |  |  |
Adjustment For Increase Decrease In Deferred Income | $ 100 |  |

X
- Definition Adjustment for increase decrease in deferred income. + References No definition available. + Details
Name: | ihg_AdjustmentForIncreaseDecreaseInDeferredIncome
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reconciliation of profit (loss) to net cash flows from operating activities. + References No definition available. + Details
Name: | ihg_ReconciliationOfProfitLossToNetCashFlowsFromOperatingActivitiesLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ihg_AgreementsAxis=ihg_CoBrandingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |