Other Equity Instruments - Summary of Coupon Details - Summary of Perpetual Contingent Convertible (Parenthetical) (Detail) - EUR 500 million [member] - Perpetual contingent convertible securities [member]

12 Months Ended

Dec. 31, 2025

Disclosure of other equity instruments [line items]

5.625%

^[1]

Borrowings, interest rate basis

5-year mid swap plus a margin of 5.207%.

Borrowings, margin interest rate

5.207%

[1]	The coupon is fixed at 5.625% until the first call date and reset thereafter to a 5-year mid swap plus a margin of 5.207%.