Other Equity Instruments - Summary of Coupon Details - Summary of Perpetual Contingent Convertible (Detail) - EUR (€) € in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Disclosure of other equity instruments [line items] | |||||
| Borrowings | € 1,982 | € 3,013 | |||
| Perpetual contingent convertible securities [member] | |||||
| Disclosure of other equity instruments [line items] | |||||
| Borrowings | € 500 | 500 | € 500 | ||
| EUR 500 million [member] | Perpetual contingent convertible securities [member] | |||||
| Disclosure of other equity instruments [line items] | |||||
| Coupon rate | [1] | 5.625% | |||
| Coupon date | Semi-annually, April 15 | ||||
| Borrowing maturity | 2029 | ||||
| Borrowings | € 500 | € 500 | € 500 | ||
| Borrowings currency | EUR | ||||
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