Loans and Other Borrowings - Summary of Loans and Other Borrowings (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2019 EUR (€)	Dec. 31, 2019 GBP (£)
GBP400m 3.875% bonds 2022 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount		£ 400,000,000
Bond interest rate	3.875%	3.875%
Maturity date	28 November 2022
GBP300m 3.75% bonds 2025 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount		£ 300,000,000
Bond interest rate	3.75%	3.75%
Maturity date	14 August 2025
GBP350m 2.125% bonds 2026 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount		£ 350,000,000
Bond interest rate	2.125%	2.125%
Maturity date	24 August 2026
EUR500m 2.125% bonds 2027 [member]
Disclosure of detailed information about borrowings [line items]
Notional amount \| €	€ 500,000,000
Bond interest rate	2.125%	2.125%
Maturity date	15 May 2027

The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsMaturity
Namespace Prefix:	ifrs-full_
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 domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ihg_FourHundredMillionPoundThreePointEightSevenFivePercentageBondsDueInTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ihg_ThreeHundredMillionPoundThreePointSevenFivePercentageBondsDueInTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ihg_ThreeFiftyMillionPoundTwoPointOneTwoFivePercentageBondsDueInTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ihg_FiveHundredMillionPoundTwoPointOneTwoFivePercentageBondsDueInTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: