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Discontinued operations - Discontinued operations, Condensed financial statements (Details) - EUR (€) € in Millions | 8 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Profit/(loss) after tax from discontinued operations |  | € 1,542.0 | € 1,241.0 | € 1,058.0
Condensed consolidated income statements |  |  |  |
Interest income |  | 101,710.0 | 109,012.0 | 101,742.0
Dividend income |  | 715.0 | 710.0 | 568.0
Investments accounted for using the equity method |  | 665.0 | 687.0 | 591.0
Net commissions |  | 12,976.0 | 12,376.0 | 11,495.0
Other operating results |  | (846.0) | (1,749.0) | (1,929.0)
Total income |  | 58,311.0 | 58,043.0 | 53,951.0
Operating profit/(loss) before tax | € 6,193.0 | 18,681.0 | 17,347.0 | 15,005.0
Tax on profit | € (635.0) | (4,723.0) | (4,844.0) | (3,880.0)
Profit/(loss) for the year |  | 15,500.0 | 13,744.0 | 12,183.0
Santander Bank Polska S.A. |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Profit/(loss) after tax from discontinued operations |  | 1,542.0 | 1,241.0 | 1,058.0
Discontinued operations | Santander Bank Polska S.A. |  |  |  |
Condensed consolidated income statements |  |  |  |
Interest income |  | 3,006.0 | 2,881.0 | 2,611.0
Dividend income |  | 4.0 | 4.0 | 3.0
Investments accounted for using the equity method |  | 28.0 | 24.0 | 22.0
Net commissions |  | 685.0 | 634.0 | 562.0
Net trading income |  | 74.0 | 62.0 | 68.0
Other operating results |  | (77.0) | (109.0) | (94.0)
Total income |  | 3,720.0 | 3,496.0 | 3,172.0
Administrative expenses, depreciation and amortisation cost |  | (1,014.0) | (885.0) | (793.0)
Impairment losses charged to income for the year |  | (285.0) | (508.0) | (658.0)
Other results and provisions |  | (471.0) | (423.0) | (267.0)
Operating profit/(loss) before tax |  | 1,950.0 | 1,680.0 | 1,454.0
Tax on profit |  | (408.0) | (439.0) | (396.0)
Profit/(loss) for the year |  | 1,542.0 | 1,241.0 | 1,058.0
Renegotiation and contractual modifications | Discontinued operations | Santander Bank Polska S.A. |  |  |  |
Condensed consolidated income statements |  |  |  |
Impairment losses charged to income for the year |  | € (144.0) | € (334.0) | € (457.0)

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