Financial risk management and derivative financial instruments - Disclosure of Detailed Information About Hedging Instruments (Detail) £ in Millions, Euro in Millions, $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) Euro GBP (£)	Dec. 31, 2021 USD ($)
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Fair value \| $	$ 48	$ 40
Cash flow hedge of November 2018 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	May 2027
Hedging instrument-Risk	Foreign exchange
Hedging instrument-Type	Cash flow
Hedging instrument-Hedged item	500m 2.125% bonds 2027
Cash flow hedge of November 2018 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| £	436
Cash flow hedge of November 2018 [Member] \| Pay Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	3.50%
Cash flow hedge of November 2018 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| Euro	500
Cash flow hedge of November 2018 [Member] \| Receive Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	2.125%
Cash flow hedge of October 2020 [Member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Maturity	October 2024
Hedging instrument-Risk	Foreign exchange
Hedging instrument-Type	Cash flow
Hedging instrument-Hedged item	500m 1.625% bonds 2024
Cash flow hedge of October 2020 [Member] \| Pay Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Payleg \| £	454
Cash flow hedge of October 2020 [Member] \| Pay Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	2.70%
Cash flow hedge of October 2020 [Member] \| Receive Hedging Instrument [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument- Receive leg \| Euro	500
Cash flow hedge of October 2020 [Member] \| Receive Hedging Instrument [member] \| Fixed interest rate [member]
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument - Interest rate	1.625%

The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 23B
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_23B_b&doctype=Standard
-URIDate 2022-03-24

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard
-URIDate 2022-03-24

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The description of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 22
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The description of the nature of risks being hedged.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 22
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_c&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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

- Definition

The description of the type of a hedge used by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 22
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_a&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

+ References

+ Details

Name:	ifrs-full_FinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 23B
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_23B_a&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 24A
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24A_d&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of Hedgeinstrument maturity

+ References

No definition available.

+ Details

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Namespace Prefix:	ihg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal amounts of hedging instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	ihg_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_TypesOfHedgesAxis=ihg_CashFlowHedgeOfNovember2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ihg_PayHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=ifrs-full_FixedInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ihg_ReceiveHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfHedgesAxis=ihg_CashFlowHedgeOfOctober2020Member
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