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Goodwill and other intangible assets - Summary of detailed information about intangible assets (Detail) - Management contracts [member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Kimpton [member] |
Disclosure of detailed information about business combination [line items] |
Net book value | $ 10
Remaining amortisation period | 20 years
Six Senses [member] |
Disclosure of detailed information about business combination [line items] |
Net book value | $ 44
Remaining amortisation period | 30 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_c&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Weighted average remaining amortisation periods for intangible assets. + References No definition available. + Details
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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_ClassesOfAssetsAxis=ihg_ManagementContractsMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |