Net Gains (Losses) from Derecognition of Financial Assets Measured at Amortized Cost (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Gain and Losses on derecognition of Financial Assets at Amortized Cost [Abstract] | |||
| Gains | € 21 | € 10 | € 5 |
| Losses | (12) | (21) | (101) |
| Net gains (losses) from derecognition of financial assets measured at amortized cost | € 9 | € (11) | € (96) |