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System Fund - Summary of System Fund Revenues (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
System fund [line items]
System fund revenue	$ 1,217	$ 928	$ 765
Assessment fees and contributions received from hotels and other revenues [member]
System fund [line items]
System fund revenue	989	727	490
Loyalty programme revenue [member]
System fund [line items]
System fund revenue	$ 228	$ 201	$ 275

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- Definition

System fund.

+ References

No definition available.

+ Details

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

X

- Definition

System fund revenue.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: