Fair Value - Gains and Losses Recognized in the Income Statement on Financial Assets and Financial Liabilities (Detail) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Fair Value Financial Assets And Liabilities [abstract] | ||
| Trading | € 195 | € (1,643) |
| Designated | € 25,783 | € 20,912 |