Revenue - Summary of Information About Contract Assets (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Contract assets [abstract]
Contract assets, Beginning balance	$ 336	$ 334
Additions	45	74
Recognised as a deduction to revenue	(35)	(25)
Impairment charges		(53)
Repayments	(1)
Exchange and other adjustments	1	6
Contract assets, Ending balance	346	336
Current	30	25
Non-current	$ 316	$ 311

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_105&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_ContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ifrs-full_ContractAssetsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of current contract assets. [Refer: Contract assets]

+ References

+ Details

Name:	ifrs-full_CurrentContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The decrease in contract assets resulting from impairment. [Refer: Contract assets; Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 118
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_118_c&doctype=Standard
-URIDate 2021-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of non-current contract assets. [Refer: Contract assets]

+ References

+ Details

Name:	ifrs-full_NoncurrentContractAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contract with customer assets acquisition costs paid during period.

+ References

No definition available.

+ Details

Name:	ihg_ContractWithCustomerAssetsAcquisitionCostsPaidDuringPeriod
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Decrease contract assets recognised as a deduction to revenue.

+ References

No definition available.

+ Details

Name:	ihg_DecreaseContractAssetsRecognisedAsDeductionToRevenue
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The decrease in contract assets resulting from repayments.

+ References

No definition available.

+ Details

Name:	ihg_DecreaseThroughRepaymentsOfContractAssets
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Exchange and other adjustments to contract assets.

+ References

No definition available.

+ Details

Name:	ihg_ExchangeAndOtherAdjustmentsToContractAssets
Namespace Prefix:	ihg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration