XML 435 R79.htm IDEA: XBRL DOCUMENT
v3.20.4

Segmental Information - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of reportable segments [line items] |  |  |
Number of reportable segments | Segment | 4 |  |
Gain on disposal of hotel assets | $ (16) | $ (21) | $ (14)
Americas [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Proceeds from business interruption insurance | 4 | $ 10 |
Litigation settlement | 4 |  |
EMEAA [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Gain on disposal of hotel assets | $ 3 |  |
Geographic concentration risk2 [member] | Revenue [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Concentration risk benchmark | revenue relating to an individual country is separately disclosed when it represents 10% or more of total revenue |  |
Concentration risk percentage | 10.00% |  |
Geographic concentration risk2 [member] | Non-current Assets [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Concentration risk benchmark | non-current assets relating to an individual country are separately disclosed when they represent 10% or more of total non-current assets |  |
Concentration risk percentage | 10.00% |  |

X
- 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
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gain on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_f&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_GainsOnLitigationSettlements
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_OtherOperatingIncomeExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Concentration risk benchmark description2. + References No definition available. + Details
Name: | ihg_ConcentrationRiskBenchmarkDescription2
Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Concentration risks percentage + References No definition available. + Details
Name: | ihg_ConcentrationRisksPercentage
Namespace Prefix: | ihg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of reportable segments2 + References No definition available. + Details
Name: | ihg_NumberOfReportableSegments2
Namespace Prefix: | ihg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from business interruption insurance + References No definition available. + Details
Name: | ihg_ProceedsFromBusinessInterruptionInsurance
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=srt_AmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=ihg_EMEAAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ihg_ConcentrationRiskByType1Axis=ihg_GeographicConcentrationRisk2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ihg_ConcentrationRiskByBenchmark1Axis=ihg_RevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ihg_ConcentrationRiskByBenchmark1Axis=ihg_NonCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |