Financing Net Investment Result - Summary of Financing Net Investment Result (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Statement1 [Line Items] | |||
| - Subordinated loans | € (82) | € (99) | € (115) |
| - Trust pass-through securities | (8) | (9) | (9) |
| - Borrowings | (88) | (82) | (58) |
| On December 31 | € (178) | € (190) | € (182) |