Other Equity Instruments - Summary of Coupon Details - Perpetual Cumulative Subordinated Bonds (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of other equity instruments [line items]
Borrowings	€ 1,982	€ 3,013
Perpetual cumulative subordinated bonds [member]
Disclosure of other equity instruments [line items]
Borrowings	€ 454	454	€ 454
Perpetual cumulative subordinated bonds [member] \| EUR 136 million [member]
Disclosure of other equity instruments [line items]
Borrowings original currency	EUR
Coupon rate	1.425%
Coupon date	Annually, October 14
Year of next call	2028
Borrowings	€ 136	136	136
Perpetual cumulative subordinated bonds [member] \| EUR 203 million [member]
Disclosure of other equity instruments [line items]
Borrowings original currency	EUR
Coupon rate	0.496%
Coupon date	Annually, March 4
Year of next call	2031
Borrowings	€ 203	203	203
Perpetual cumulative subordinated bonds [member] \| EUR 114 million [member]
Disclosure of other equity instruments [line items]
Borrowings original currency	EUR
Coupon rate	3.568%
Coupon date	Annually, June 8
Year of next call	2035
Borrowings	€ 114	€ 114	€ 114

Coupon as of date.

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- Definition

Coupon interest rate.

+ References

No definition available.

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- Definition

Line items of other equity instruments.

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
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- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The currency in which the borrowings are denominated. [Refer: Borrowings]

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