Transfer of Financial Assets, Assets Pledged and Received as Collateral - Continuing Involvement Accounting (Detail) - Continuing Involvement Accounting - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Carrying amount of the original assets transferred | ||
| Disclosure of continuing involvement in derecognised financial assets [line items] | ||
| Trading securities | € 1,016 | € 1,073 |
| Non-trading financial assets mandatory at fair value through profit or loss | 0 | 0 |
| Carrying amount of the assets continued to be recognized | ||
| Disclosure of continuing involvement in derecognised financial assets [line items] | ||
| Trading securities | 21 | 26 |
| Non-trading financial assets mandatory at fair value through profit or loss | 0 | 0 |
| Carrying amount of associated liabilities | ||
| Disclosure of continuing involvement in derecognised financial assets [line items] | ||
| Carrying amount of associated liabilities | € 40 | € 52 |