Transfers of Financial Assets - Additional Information (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Amount of collateral pledged for derivative transactions | € 2,000 | € 2,800 |
| Assets Pledged For Repurchase Agreements [member] | ||
| Disclosure of financial assets [line items] | ||
| Net exposure | € 0 | € 0 |