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Cash and cash equivalents - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and cash equivalents [line items] |  |
Bank balances | $ 95 | $ 106
Bank overdrafts | 87 | 104
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 | 16 | 2
UK Portfolio [member] |  |
Cash and cash equivalents [line items] |  |
Restricted Cash and cash equivalents | $ 6 | $ 0
Maximum [member] |  |
Cash and cash equivalents [line items] |  |
Short-term deposits and repurchase agreements maturity period | 3 months |

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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
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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
Balance Type: | na
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |