Non-current assets held for sale and liabilities associated with non-current assets held for sale - Narrative (Details) - Assets and liabilities classified as held for sale - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Assets And Liabilities Classified As Held For Sale [Line Items] | |||
| Provision recognised for non-current assets held for sale | € 2,357 | € 2,606 | € 2,956 |
| Net charges recorded against valuation allowances | 131 | 163 | 139 |
| Recoveries | 59 | € 71 | € 88 |
| Santander Bank Polska S.A. | |||
| Assets And Liabilities Classified As Held For Sale [Line Items] | |||
| Remeasurement of disposal group or assets held for sale, write-off | € 2,339 | ||