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Financial risk management and derivative financial instruments - Disclosure of Short-term Deposits by Counterparty Credit Rating (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of credit risk exposure [line items]
Short-term deposits	$ 515	$ 411
Money market funds	334	415
Repurchase agreements	100	40
AAA
Disclosure of credit risk exposure [line items]
Short-term deposits	0	0
Money market funds	334	415
Repurchase agreements	71	26
AA+
Disclosure of credit risk exposure [line items]
Short-term deposits	0	0
Money market funds	0	0
Repurchase agreements	0	9
AA
Disclosure of credit risk exposure [line items]
Short-term deposits	0	0
Money market funds	0	0
Repurchase agreements	14	2
AA-
Disclosure of credit risk exposure [line items]
Short-term deposits	94	41
Money market funds	0	0
Repurchase agreements	15	3
A+
Disclosure of credit risk exposure [line items]
Short-term deposits	245	107
Money market funds	0	0
Repurchase agreements	0	0
A
Disclosure of credit risk exposure [line items]
Short-term deposits	166	249
Money market funds	0	0
Repurchase agreements	0	0
A-
Disclosure of credit risk exposure [line items]
Short-term deposits	0	0
Money market funds	0	0
Repurchase agreements	0	0
BBB+ and below
Disclosure of credit risk exposure [line items]
Short-term deposits	10	14
Money market funds	0	0
Repurchase agreements	$ 0	$ 0

X

- Definition

The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 45
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-URIDate 2025-03-27

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- Definition

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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- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
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-URIDate 2025-03-27

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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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-IssueDate 2025-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard
-URIDate 2025-03-27

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