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System Fund and reimbursables - Summary of System Fund and Reimbursable Revenues and Expenses (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
System Fund And Reimbursables [Abstract] |  |  |
System Fund revenues | $ 1,611 | $ 1,564 | $ 1,217
Reimbursable revenues | 1,000 | 896 | 832
System Fund and reimbursable revenues | 2,611 | 2,460 | 2,049
System Fund expense | (1,694) | (1,545) | (1,322)
Reimbursable expenses | (1,000) | (896) | (832)
System Fund and reimbursable expenses | $ (2,694) | $ (2,441) | $ (2,154)

X
- Definition Reimbursable expenses. + References No definition available. + Details
Name: | ihg_ReimbursableExpenses
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reimbursable revenues. + References No definition available. + Details
Name: | ihg_ReimbursableRevenues
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition System fund and reimbursable expenses. + References No definition available. + Details
Name: | ihg_SystemFundAndReimbursableExpenses
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition System fund and reimbursable revenues. + References No definition available. + Details
Name: | ihg_SystemFundAndReimbursableRevenues
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition System fund and reimbursables. + References No definition available. + Details
Name: | ihg_SystemFundAndReimbursablesAbstract
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition System fund expenses. + References No definition available. + Details
Name: | ihg_SystemFundExpenses
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition System fund revenue. + References No definition available. + Details
Name: | ihg_SystemFundRevenue
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration