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Revenue - Movements in Contract Costs, Typically Developer Commissions (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract] |  |  |  |  |
Contract costs beginning balance | $ 72 | $ 60 |  |  |
Costs incurred | 11 | 19 |  |  |
Amortisation | (9) | (7) |  |  |
Exchange and other adjustments | 1 |  |  |  |
Contract costs ending balance | 75 | 72 |  |  |
Contract costs disclosed as: |  |  |  |  |
Current |  |  | $ 5 | $ 5 | $ 5
Non-current |  |  | 70 | 67 | 55
Total contract costs | $ 72 | $ 60 | $ 75 | $ 72 | $ 60

X
- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 128 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_128_b&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 128 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_128_a&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition IFRS current Assets recognised from costs to obtain or fulfill contracts with customers. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition IFRS non-current Assets recognised from costs to obtain or fulfill contracts with customers. + 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 Costs incurred to obtain or fulfill contracts with customers. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
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- Definition Costs incurred to obtain or fulfil contracts with customers exchange and other. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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