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System Fund - Summary of System Fund (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
System fund [line items] |  |  |
Assessment fees and contributions received from hotels | $ 1,562 | $ 1,439 | $ 1,351
Proceeds from sale of IHG Rewards Club points | 324 | 283 | 222
Marketing | 321 | 335 | 308
IHG Rewards Club | 452 | 360 | 345
Payroll costs | 339 | 311 | 295
Net (deficit)/surplus for the year | (69) | 41 | 118
Interest expense on borrowings | 69 | 74 | 74
IHG Rewards Club Loyalty Programme [member] |  |  |
System fund [line items] |  |  |
Interest expense on borrowings | $ 7 | $ 3 | $ 2

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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense relating to the marketing and selling of goods or services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_SalesAndMarketingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Assessment fees and contributions received. + References No definition available. + Details
Name: | ihg_AssessmentFeesAndContributionsReceived
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net surplus (deficit) of fund. + References No definition available. + Details
Name: | ihg_NetSurplusDeficitOfFund
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds from sale of rewards club points + References No definition available. + Details
Name: | ihg_ProceedsFromSaleOfRewardsClubPoints
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition System fund Line Items. + 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 payroll costs. + References No definition available. + Details
Name: | ihg_SystemFundPayrollCosts
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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