v3.26.1
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)