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Investment in Associates and joint ventures - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) Associate | Dec. 31, 2023 | Dec. 31, 2022 USD ($)
Disclosure of investment in associates and joint ventures [line items] |  |  |
Number of material associate | Associate | 1 |  |
Americas Region [Member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Investment in associates impairment reversal |  |  | $ 2
111 East 48th Street Holdings LLC [member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Material associate investment interest | 19.90% |  |
Name of associate | 111 East 48th Street Holdings LLC |  |
Barclay associate [member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Material associate investment interest | 19.90% | 19.90% |
Description of nature of entity's relationship with associate | The Group held one associate investment which had a significant impact on profit for the prior year, a 19.9% interest in 111 East 48th Street Holdings, LLC (the ‘Barclay associate’) which owns InterContinental New York Barclay, a hotel managed by the Group. The investment is classified as an associate and equity accounted. While the Group has the ability to exercise significant influence through certain decision rights, approval rights relating to the hotel’s operating and capital budgets rest solely with the 80.1% majority member. The Group’s ability to receive cash dividends is dependent on the hotel generating sufficient income to satisfy specified owner returns. |  |
Barclay associate [member] | 111 East 48th Street Holdings LLC [member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Name of associate | 111 East 48th Street Holdings |  |
Material associate investment interest held by majority member | 80.10% |  |
American Associate [Member] |  |  |
Disclosure of investment in associates and joint ventures [line items] |  |  |
Impairment loss | $ 4 |  |

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_b&doctype=Standard -URIDate 2024-03-27 + Details
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