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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

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Period Type:	duration

X

- 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

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X

- References

No definition available.

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- References

No definition available.

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X

- Definition

IFRS current Assets recognised from costs to obtain or fulfill contracts with customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	ihg_
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Period Type:	instant

X

- 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_
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X

- Definition

Costs incurred 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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X

- 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_
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