v3.26.1
Additional disclosure requirements - Condensed Statements of Income (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Condensed Income Statements, Captions [Line Items]    
Interest income € 52,336 € 51,338
Dividends from affiliated companies 624 471
Interest expense (29,625) (30,127)
Non-interest income: [1] 682 745
Non-interest expense: (1,305) (1,196)
Operating profit/(loss) before tax 9,961 9,104
Tax expense or income from continuing operations (2,442) (2,367)
Profit/(loss) for the period from continuing operations 7,519 6,737
Income/ (charges) after tax from discontinued operations 1,895 726
Profit/(loss) for the period 9,414 7,463
Banco Santander S.A. | Reportable legal entities    
Condensed Income Statements, Captions [Line Items]    
Interest income 16,054 15,769
Dividends from affiliated companies 2,686 2,869
Interest expense (9,122) (9,344)
Interest income / (charges) 6,932 6,425
Provision for credit losses (666) (606)
Interest income / (charges) after provision for credit losses 6,265 5,819
Non-interest income: 3,179 3,292
Non-interest expense: (4,264) (3,852)
Operating profit/(loss) before tax 5,180 5,259
Tax expense or income from continuing operations (597) (524)
Profit/(loss) for the period from continuing operations 4,583 4,735
Income/ (charges) after tax from discontinued operations 4,043 856
Profit/(loss) for the period 8,626 5,591
Banco Santander S.A. | Reportable legal entities | Earnings Assets    
Condensed Income Statements, Captions [Line Items]    
Interest income 13,368 12,900
Banco Santander S.A. | Reportable legal entities | Bank subsidiaries    
Condensed Income Statements, Captions [Line Items]    
Dividends from affiliated companies 2,263 2,394
Banco Santander S.A. | Reportable legal entities | Non-bank subsidiaries    
Condensed Income Statements, Captions [Line Items]    
Dividends from affiliated companies € 423 € 475
[1] Includes -EUR 364 million at 30 June 2026 (-EUR 299 million at 30 June 2025) derived from the net monetary loss generated in Argentina as a result of the application of IAS 29 Financial reporting in hyperinflationary economies.