v3.25.2
Provisions - Non-tax-related proceedings (Details)
€ in Thousands, £ in Millions, zł in Millions
5 Months Ended 6 Months Ended 12 Months Ended 19 Months Ended
Jul. 11, 2023
EUR (€)
Feb. 06, 2023
EUR (€)
Jan. 13, 2022
EUR (€)
Dec. 09, 2021
EUR (€)
Sep. 16, 2021
EUR (€)
May 29, 2020
May 16, 2021
EUR (€)
Jun. 30, 2025
EUR (€)
Jun. 30, 2025
PLN (zł)
Dec. 31, 1999
shares
Dec. 31, 1994
child
Dec. 31, 2022
EUR (€)
Jun. 30, 2025
PLN (zł)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
GBP (£)
Nov. 22, 2024
EUR (€)
Apr. 25, 2024
judgement
judge
Nov. 30, 2023
preliminaryRuling
Apr. 30, 2023
preliminaryRuling
Jan. 23, 2019
Dec. 31, 2017
EUR (€)
Disclosure of other provisions [line items]                                          
Provisions               € 8,098,000           € 8,407,000              
Number of ruling requested by first instance Court 3 of Santa Coloma de Farners | preliminaryRuling                                     3    
Number of ruling requested by supreme court | preliminaryRuling                                   2      
Number of judges of the Supreme Court who declined to participate in the resolution | judge                                 9        
Number of judges who submitted dissenting opinions | judge                                 6        
Banco Popular Espanol S.A.                                          
Disclosure of other provisions [line items]                                          
Estimated cost of compensation to shareholders and bondholders                                         € 680,000
Estimated cost of compensation to shareholders and bondholders applied to the commercial loyalty program                                         € 535,000
Santander Bank Polska and Santander Consumer Bank Poland                                          
Disclosure of other provisions [line items]                                          
Mortgage loans denominated in, or indexed to, CHF               1,045,600         zł 4,435.6                
Other combined provisions                                          
Disclosure of other provisions [line items]                                          
Provisions               4,809,000           5,051,000              
Financial Conduct Authority (FCA) Review of The Vehicle Finance Market | Other combined provisions | UK                                          
Disclosure of other provisions [line items]                                          
Provisions                           € 341,800 £ 293            
Delforca case to request Court judgment on the validity of the swaps                                          
Disclosure of other provisions [line items]                                          
Arbitration matter, amount claimed by entity               66,000                          
Arbitration matter, amount claimed by counterparty               57,000                          
Arbitration matter, amount to be received by entity         € 66,000                                
Arbitration matter, interest to be received by entity         € 11,000                                
Planos Economicos                                          
Disclosure of other provisions [line items]                                          
Period of suspension of economic plan processes           5 years                              
Planos Economicos | Banco Santander Brasil SA                                          
Disclosure of other provisions [line items]                                          
Provisions               176,300                          
Banco Popular’s Compensation Request                                          
Disclosure of other provisions [line items]                                          
Estimated financial effect of contingent liabilities                               € 2,277,650          
Individual plaintiff, CEO functions                                          
Disclosure of other provisions [line items]                                          
Provisions               € 35,500                          
Compensation sought in litigation claim             € 112,000         € 61,900                  
Losses on litigation settlements     € 51,400 € 67,800                                  
Litigation contingencies, decrease in losses on litigation settlements   € 8,000                                      
Gains on litigation settlements € 9,600                                        
Individual plaintiff, CEO functions | Share Based Variable Remuneration Award 2018                                          
Disclosure of other provisions [line items]                                          
Variable remuneration, deferred payment, long-term metric achievement, percentage               33.30% 33.30%                        
Conversion of active loans from Swiss Francs to PLN Loans | Santander Bank Polska and Santander Consumer Bank Poland                                          
Disclosure of other provisions [line items]                                          
Mortgage loans, provision and adjustment to gross carrying amount               € 1,534,400         6,508.7                
Mortgage loans, adjustment to gross carrying amount               969,100         4,110.6                
Increase in adjustment to gross carrying amount, mortgage loans               13,500 zł 58.1                        
Increase through other costs associated               75,200 318.1                        
Conversion of active loans from Swiss Francs to PLN Loans | Active loans, under IAS 37 | Santander Bank Polska and Santander Consumer Bank Poland                                          
Disclosure of other provisions [line items]                                          
Provisions               565,300         zł 2,398.1                
Increase in existing provisions               € 158,800 zł 671.9                        
Inheritance trust | Banco Santander Mexico S.A. Institucion De Banca Multiple, Grupo Financiero Santander Mexico                                          
Disclosure of other provisions [line items]                                          
Number of sons involved in testamentary trust | child                     4                    
Amount of shares to be transferred by trustee | shares                   36,700,000                      
Spanish Supreme Court, mortgage expenses                                          
Disclosure of other provisions [line items]                                          
Percentage of public notary expenses and agency expenses to be paid                                       50.00%  
Percentage of the registry expenses to be paid                                       100.00%  
Number of judgments rendered | judgement                                 2