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System Fund - Summary of System Fund Revenues (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
System fund [line items] |  |  |
System fund revenue | $ 765 | $ 1,373 | $ 1,233
Assessment fees and contributions received from hotels [member] |  |  |
System fund [line items] |  |  |
System fund revenue | 490 | 1,036 | 979
Loyalty programme revenue [member] |  |  |
System fund [line items] |  |  |
System fund revenue | $ 275 | $ 337 | $ 254

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- Definition System fund. + References No definition available. + Details
Name: | ihg_SystemFundLineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
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

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=ihg_AssessmentFeesAndContributionsReceivedFromHotelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=ihg_LoyaltyProgrammeRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |