Other Equity Instruments - Summary of Coupon Details - Junior Perpetual Capital Securities (Parenthetical) (Detail) € in Millions, $ in Millions	Dec. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)
Disclosure of other equity instruments [line items]
Principal amount		€ 950
Debt instrument redeemed amount		€ 429
USD 500 million [member] \| Junior perpetual capital securities [member]
Disclosure of other equity instruments [line items]
Principal amount \| $	$ 500
Basis point	0.29%	0.29%
Credit spread adjustment percentage	0.10%	0.10%
USD 500 million [member] \| Top of range [member] \| Junior perpetual capital securities [member]
Disclosure of other equity instruments [line items]
Basis point interest rate	8.50%	8.50%
EUR 950 million [member] \| Junior perpetual capital securities [member]
Disclosure of other equity instruments [line items]
Principal amount		€ 950
EUR 950 million [member] \| Bottom of range [member] \| Junior perpetual capital securities [member]
Disclosure of other equity instruments [line items]
Basis point interest rate	8.00%	8.00%
Credit spread adjustment percentage	0.10%	0.10%

Credit spread adjustment percentage.

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- Definition

Debt instrument redeemed amount.

+ References

No definition available.

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- Definition

Line items of other equity instruments.

+ References

No definition available.

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- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2025-01-01
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-URIDate 2025-03-27

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- Definition

The interest rate on borrowings. [Refer: Borrowings]

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- Definition

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

+ 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 112
-Subparagraph c
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-URIDate 2025-03-27

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