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Investment in Associates and joint ventures - Summary of Investments in Associates (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates and joint ventures [line items] |  |  |  |
Beginning balance |  | $ 48 |  |
Share of profits |  | (10) | $ (31) | $ 59
Ending balance |  | 51 | 48 |
Investments accounted for using equity method |  | 51 | 48 |
Cost [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Beginning balance |  | 101 | 89 |
Additions |  | 6 | 3 |
Share of profits | [1] | 10 | 13 |
System Fund share of losses |  | (2) | (3) |
Dividends and distributions |  | (7) | (1) |
Ending balance |  | 108 | 101 | 89
Accumulated impairment [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Beginning balance |  | (53) | (53) |
Impairment reversal |  | (4) |  |
Ending balance |  | (57) | (53) | $ (53)
Joint ventures [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments accounted for using equity method |  | 5 | 2 |
Barclay associate [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments accounted for using equity method |  | 7 | 3 |
Other associates [Member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Investments accounted for using equity method |  | $ 39 | $ 43 |
[1] | In 2023 and 2022, the total share of profits/(losses) from associates and joint ventures in the Group income statement included $18m gain and $18m loss, respectively, due to the liability recognised in 2022 and its subsequent reversal (see note 6). In 2022, $42m was included within exceptional items in addition to the $18m.

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_24_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Total for all subsidiaries [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_g&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Additions to associates and joint ventures. + References No definition available. + Details
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