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System Fund and reimbursables - Summary of System Fund Revenues (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
System Fund And Reimbursables [Line Items] |  |  |
System Fund revenues | $ 1,611 | $ 1,564 | $ 1,217
Loyalty programme revenues, net of the cost of point redemptions [member] |  |  |
System Fund And Reimbursables [Line Items] |  |  |
System Fund revenues | 355 | 379 | 228
Marketing, reservation and other hotel fees [member] |  |  |
System Fund And Reimbursables [Line Items] |  |  |
System Fund revenues | $ 1,256 | $ 1,185 | $ 989

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

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |