Related party disclosures - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) associate	Dec. 31, 2024 USD ($) associate
Disclosure of transactions between related parties [Line Items]
Maximum exposure remaining on performance guarantee	$ 2	$ 4
Number of associates with a performance guarantee \| associate	1
Associates \| Investment in preferred shares of associates
Disclosure of transactions between related parties [Line Items]
Preferred equity investment in associates	$ 35	$ 34
Number of associates \| associate	3	3
Amounts receivable, related party transactions	$ 47
Barclay associate
Disclosure of transactions between related parties [Line Items]
Loan to and from material associate investment (offset in accordance with IAS32)	$ 237	$ 237
Average interest rate on loans	4.10%	4.10%

The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2025-01-01
-Paragraph 20
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2025-en-r&anchor=para_20&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-Paragraph 18
-Subparagraph b
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-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 230
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_230_b&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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The cash outflow to acquire equity or debt instruments of other entities (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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The amount of outstanding commitments made by the entity in related party transactions. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Interest payable (receivable) equivalent average rate.

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Loans both payable and receivable offset net.

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Number Of Associates

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