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Cash and cash equivalents - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Cash and cash equivalents [line items] |  |
Bank balances | $ 116 | $ 91
Bank overdrafts | $ 110 | $ 89
Maximum [member] |  |
Cash and cash equivalents [line items] |  |
Short-term deposits maturity period | P3M |

X
- Definition Bank balances under cash pooling arrangements. + References No definition available. + Details
Name: | ihg_BankBalancesUnderCashPoolingArrangements
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Bank overdrafts under cash pooling arrangements. + References No definition available. + Details
Name: | ihg_BankOverdraftsUnderCashPoolingArrangements
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash and cash equivalents. + References No definition available. + Details
Name: | ihg_CashAndCashEquivalents1LineItems
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short-term deposits maturity period. + References No definition available. + Details
Name: | ihg_ShorttermDepositsMaturityPeriod
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |