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Cash and cash equivalents - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash and cash equivalents [line items] |  |
Bank balances | $ 55 | $ 95
Bank overdrafts | 51 | 87
Local countries which do not have the current ability to repatriate funds through dividends [member] |  |
Cash and cash equivalents [line items] |  |
Restricted Cash and cash equivalents | 44 | 16
UK Portfolio [member] |  |
Cash and cash equivalents [line items] |  |
Restricted Cash and cash equivalents | $ 5 | $ 6
Maximum [member] |  |
Cash and cash equivalents [line items] |  |
Short-term deposits and repurchase agreements maturity period | 3 years |

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Bank overdrafts under cash pooling arrangements. + References No definition available. + Details
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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
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Short-term deposits and repurchase agreement maturity period. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:durationItemType
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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: |

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