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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
System Fund And Reimbursables [Abstract] |  |  |  |  |
System Fund revenues | $ 1,564 | $ 1,217 |  | $ 928 |
Reimbursable revenues | 896 | 832 |  | 589 |
System Fund and reimbursable revenues | 2,460 | 2,049 | [1] | 1,517 | [1]
System Fund expense | (1,545) | (1,322) |  | (939) |
Reimbursable expenses | (896) | (832) |  | (589) |
System Fund and reimbursable expenses | $ (2,441) | $ (2,154) | [1] | $ (1,528) | [1]
[1] | Re-presented for the adoption of IFRS 17 ‘Insurance Contracts’ and to combine System Fund revenues and reimbursables (see New accounting standards and other presentational changes).

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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