XML 451 R209.htm IDEA: XBRL DOCUMENT v3.10.0.1

System Fund - Summary of System Fund Revenues (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
System fund [line items]
System fund revenue	$ 1,233	$ 1,242	$ 1,199
Assessment fees and contributions received from hotels [member]
System fund [line items]
System fund revenue	979	934	887
Loyalty programme revenue [member]
System fund [line items]
System fund revenue	$ 254	$ 308	$ 312

X

- Definition

System fund.

+ References

No definition available.

+ Details

Name:	ihg_SystemFundLineItems
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

Name:	ifrs-full_ProductsAndServicesAxis=ihg_AssessmentFeesAndContributionsReceivedFromHotelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=ihg_LoyaltyProgrammeRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: