The amortisation method used for intangible assets other than goodwill with finite useful lives. [Refer: Intangible assets other than goodwill; Depreciation and amortisation expense]

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The depreciation method used for property, plant and equipment. [Refer: Property, plant and equipment]

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The description of the significant payment terms in contracts with customers.

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The amount of increase (decrease) in the fair value measurement of liabilities, recognised in profit or loss before tax, due to a reasonably possible increase in an unobservable input. [Refer: Tax income (expense)]

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

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The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

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The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]

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Accounting policies.

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Amount of debt under consideration.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Percentage of margin before the asset gets impaired fully.

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Revolving credit facility exercised.

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Accounting policies - Additional Information (Detail) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Sep. 30, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)
Accounting policies [line items]
Depreciation method, property, plant and equipment	All depreciation is charged on a straight-line basis.
Payment terms of trade receivables	30 days
Outstanding letters of credit	$ 84			$ 68
2028 [member]
Accounting policies [line items]
Revolving credit facility exercised	$ 1,350
EUR500m 1.625% bonds 2024 [member]
Accounting policies [line items]
Notional amount \| €		€ 500
Amount of debt under consideration \| €		300
EUR600m 4.375% bonds 2029 [member]
Accounting policies [line items]
Notional amount \| €		€ 600	€ 750		€ 600
Intercontinental Hotels Boston [Member]
Accounting policies [line items]
Percentage of margin before the asset gets impaired fully	25.00%
Loyalty programme liability [member]
Accounting policies [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, recognised in profit or loss, before tax, liabilities	$ 86
Loyalty programme liability [member] \| System Fund [member]
Accounting policies [line items]
Deferred revenue	$ 1,653			$ 1,529		$ 1,411
Buildings [member]
Accounting policies [line items]
Estimated useful lives	50 years
Software [member]
Accounting policies [line items]
Amortisation method, intangible assets other than goodwill	straight-line basis
Bottom of range [member] \| Fixtures, fittings and equipment [member]
Accounting policies [line items]
Estimated useful lives	3 years
Bottom of range [member] \| Software [member]
Accounting policies [line items]
Estimated useful lives	3 years
Bottom of range [member] \| Software [member] \| Guest Reservation System [member]
Accounting policies [line items]
Estimated useful lives	7 years
Top of range [member] \| Fixtures, fittings and equipment [member]
Accounting policies [line items]
Estimated useful lives	25 years
Top of range [member] \| Software [member]
Accounting policies [line items]
Estimated useful lives	5 years
Top of range [member] \| Software [member] \| Guest Reservation System [member]
Accounting policies [line items]
Estimated useful lives	10 years