Long-Term Debt (Detail) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Senior debt: | ||
| Long-Term Debt [Line Items] | ||
| Fixed rate | € 61,805 | € 67,920 |
| Floating rate | 13,145 | 12,281 |
| Other | 29,022 | 26,256 |
| Subordinated debt: | ||
| Long-Term Debt [Line Items] | ||
| Fixed rate | 7,312 | 8,212 |
| Floating rate | 0 | 0 |
| Other | € 70 | € 85 |