Provisions - Schedule of other provisions by type of provision (Details) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure of other provisions [line items] | ||
| Provisions | € 9,211 | € 8,355 |
| Other combined provisions | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 5,795 | 4,993 |
| Provisions for taxes | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 763 | 720 |
| Provisions for employment-related proceedings | Brazil | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 801 | 594 |
| Provisions for other legal proceedings | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 1,739 | 1,675 |
| Provision for customer remediation | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 1,031 | 826 |
| Provision for restructuring | ||
| Disclosure of other provisions [line items] | ||
| Provisions | 534 | 279 |
| Other | ||
| Disclosure of other provisions [line items] | ||
| Provisions | € 927 | € 899 |