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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | $ 163 | $ 184
2021 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 28 | 21
Unrecognised deferred tax | 6 | 5
2022 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 10 | 11
Unrecognised deferred tax | 2 | 3
2023 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 1 | 1
Unrecognised deferred tax | 0 |
2024 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 4 | 20
Unrecognised deferred tax | 0 | 1
2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 92 | 92
Unrecognised deferred tax | 21 | 23
After 2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 46 | 26
Unrecognised deferred tax | $ 3 | $ 3

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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Unrecognised deferred tax. + References No definition available. + Details
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Namespace Prefix: | ihg_
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent unrecognised deferred tax position. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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