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v3.20.4

Trade and other receivables - Summary of Trade and Other Receivables (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Trade and other receivables [abstract] |  |
Cost reimbursements | $ 26 | $ 67

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cost reimbursements. + References No definition available. + Details
Name: | ihg_CostReimbursements
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant