v3.26.1
Risk management - Credit risk (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2025
EUR (€)
tranches
customer
line_of_business
scenario
stage
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Disclosure of credit risk exposure [line items]        
Percentage of total provisions for the most relevant units of the Group 94.00%      
Maximum exposure to credit risk € 888,496 € 908,963 € 914,491  
Financial assets 300,026 283,497 243,203  
Investments € 7,052 7,277 7,646 € 7,615
Number of business lines, commercial segment | line_of_business 7      
Number of tranches | tranches 4      
Forbearance portfolio € 25,235      
Performing loans, number of days past due criteria 90 days      
Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Financial assets with contractual cash flows modified during reporting period while loss allowance measured at lifetime expected credit losses € 3,031 3,940    
Financial assets with modified contractual cash flows while loss allowance measured at lifetime expected credit losses € 2,092 2,950    
"Large Exposures" Customers        
Disclosure of credit risk exposure [line items]        
Number of largest groups | customer 20      
"Large Exposures" Customers, top 40        
Disclosure of credit risk exposure [line items]        
Number of largest groups | customer 40      
Santander UK plc        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 222,346 236,850 235,344  
Number of prospective macroeconomic scenarios | scenario 4      
PD percentage increase from initial recognition 100.00%      
Minimum period of irregular positions to consider significant increase in risk 30 days      
Number of tranches | tranches 4      
Evolution projection period 5 years      
United Kingdom        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 244,303      
Percent at risk 21.00%      
Non-performing rate 1.08%      
Percentage decrease in non-performing loans ratio 0.25%      
United Kingdom | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Non-performing rate 0.87%      
Percentage decrease in non-performing loans ratio 0.20%      
United Kingdom | Securitised mortgage assets | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Interest only loans, mortgage portfolio, percentage 21.00%      
Loan-to-value (LTV) ratio 50.00%      
Flexible loans, mortgage portfolio, percentage 2.00%      
Buy to let mortgages, mortgage portfolio, percentage 9.00%      
Percentage of portfolio with LTV less than defined percent 82.00%      
United Kingdom | Securitised mortgage assets | Santander UK plc | LTV less than 70% | Maximum        
Disclosure of credit risk exposure [line items]        
Loan-to-value (LTV) ratio 70.00%      
Total North America        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 12.80%      
Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets € (520) (349) (286)  
Gross carrying amount | United Kingdom | Securitised mortgage assets | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Financial assets 192,047      
Other units        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 93,731      
Other units | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (759)      
Spain        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 201,013 198,936 205,994  
Risk exposure associated with instruments sharing characteristic € 305,156      
Percent at risk 26.00%      
Non-performing rate 1.94%      
Percentage decrease in non-performing loans ratio 0.72%      
Minimum period of irregular positions to consider significant increase in risk 30 days      
Coverage rate 55.00%      
Increase (decrease) in nonperforming coverage ratio 0.02%      
Cost of credit (in percent) 0.43%      
Decrease in cost of credit 0.07%      
ICO loans, granted as result of the pandemic € 25,428      
ICO loans, pandemic € 10,857      
ICO loans, percentage of total portfolio 3.60%      
Number of tranches | tranches 4      
Evolution projection period 5 years      
Spain | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers € 1,898 € 2,131 € 2,448  
Investments 36      
Spain | Foreclosed equity instruments        
Disclosure of credit risk exposure [line items]        
Investments 10      
Spain | SMEs and Corporates        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 99,395      
Percent at risk 33.00% 41.00%    
Non-performing rate 4.10%      
Decrease in portfolio of SMEs 10.10%      
Decrease in non-performing ratio 0.97%      
Spain | Property assets from home purchase mortgage loans to households        
Disclosure of credit risk exposure [line items]        
Non-performing rate 1.03%      
Percentage decrease in non-performing loans ratio 0.29%      
Increase (decrease) in residential mortgage credit risk (in percentage) 1.20%      
Debt-to-income ratio 22.00% 24.00% 24.00%  
Spain | Property assets from home purchase mortgage loans to households | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers € 162      
Spain | Property assets from home purchase mortgage loans to households | Retail & Commercial Banking        
Disclosure of credit risk exposure [line items]        
Percentage of portfolio with LTV less than defined percent 94.00%      
Spain | Property assets from home purchase mortgage loans to households | Of which property collateral        
Disclosure of credit risk exposure [line items]        
Percentage secured by mortgage 99.64% 99.65% 99.65%  
Spain | Property assets from home purchase mortgage loans to households | Less than 80% | Maximum        
Disclosure of credit risk exposure [line items]        
Loan-to-value (LTV) ratio 80.00%      
Spain | Construction and property development | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers € 1,699      
Spain | Construction and property development | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984 € 2,545 € 2,433 € 2,327
Risk exposure associated with instruments sharing characteristic 211      
Spain | Construction and property development | Credit impaired | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 0      
Non-performing rate 1.04% 2.28% 3.04%  
Coverage rate 35.48% 36.21% 39.19%  
Spain | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets € (1,086)      
Spain | Accumulated impairment | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 2,360 € 2,692 € 3,058  
Spain | Accumulated impairment | Property assets from home purchase mortgage loans to households | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 172      
Spain | Accumulated impairment | Construction and property development | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 2,144      
Spain | Gross carrying amount | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 4,258 4,823 5,506  
Spain | Gross carrying amount | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984      
Spain | Gross carrying amount | Of which property collateral | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Financial assets 2,970      
Spain | Gross carrying amount | Property assets from home purchase mortgage loans to households        
Disclosure of credit risk exposure [line items]        
Financial assets 60,002 59,316 61,097  
Spain | Gross carrying amount | Property assets from home purchase mortgage loans to households | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 334      
Spain | Gross carrying amount | Property assets from home purchase mortgage loans to households | Credit impaired        
Disclosure of credit risk exposure [line items]        
Financial assets 625 789 924  
Spain | Gross carrying amount | Property assets from home purchase mortgage loans to households | Of which property collateral        
Disclosure of credit risk exposure [line items]        
Financial assets 59,787 59,108 60,882  
Spain | Gross carrying amount | Property assets from home purchase mortgage loans to households | Of which property collateral | Credit impaired        
Disclosure of credit risk exposure [line items]        
Financial assets 618 778 908  
Spain | Gross carrying amount | Construction and property development | Foreclosed properties        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 3,843      
Spain | Gross carrying amount | Construction and property development | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984      
Spain | Gross carrying amount | Construction and property development | Credit impaired | Real estate operations in Spain        
Disclosure of credit risk exposure [line items]        
Financial assets € 31      
US | Santander Bank, National Association        
Disclosure of credit risk exposure [line items]        
Number of tranches | tranches 4      
US | Total North America        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 148,488      
Non-performing rate 4.82%      
Cost of credit (in percent) 1.62%      
Percentage increase in non-performing loans ratio 0.14%      
Percentage increase (decrease) in cost of credit (0.20%)      
US | Total North America | Santander Consumer USA Holdings Inc.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 25,204 30,669 28,877  
Non-performing rate 22.08%      
Number of prospective macroeconomic scenarios | scenario 4      
Minimum period of irregular positions to consider significant increase in risk 30 days      
Coverage rate 53.00%      
Increase (decrease) in nonperforming coverage ratio (8.85%)      
Cost of credit (in percent) 6.10%      
Percentage increase (decrease) in cost of credit (0.50%)      
Credit risk with customers € 25,318      
Lending, credit risk percentage of group 2.20%      
Percentage increase (decrease) in lending (17.00%)      
Percentage increase in nonperforming ratio 3.40%      
Number of tranches | tranches 4      
Evolution projection period 5 years      
US | Total North America | Santander Bank, National Association        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 45,741 € 54,243 55,984  
Non-performing rate 2.60%      
Number of prospective macroeconomic scenarios | scenario 4      
Minimum period of irregular positions to consider significant increase in risk 30 days      
Cost of credit (in percent) 0.93%      
Percentage increase in non-performing loans ratio 0.44%      
Credit risk with customers € 46,677      
Lending, credit risk percentage of group 4.00%      
Percentage increase (decrease) in lending (15.00%)      
Evolution projection period 5 years      
US | Total North America | Santander Bank, National Association | Maximum        
Disclosure of credit risk exposure [line items]        
Threshold percentage in determining classification of Stage 2 1.20%      
US | Total North America | Santander Bank, National Association | Minimum        
Disclosure of credit risk exposure [line items]        
Threshold percentage in determining classification of Stage 2 0.20%      
Brazil | Total South America        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 118,546      
Number of prospective macroeconomic scenarios | scenario 3      
Coverage rate 81.00% 79.00%    
Cost of credit (in percent) 4.17% 4.03%    
Credit exposure percentage 10.00%      
Evolution projection period 5 years      
Increase (decrease) in credit risk (in percentage) 2.50%      
Percentage increase in credit risk, excluding exchange rate 2.00%      
Non-performing loans ratio 6.76% 6.10%    
Net loan-loss provisions € 4,409      
Increase (decrease) in provision for loan loss (2.00%)      
Brazil | Total South America | Banco Santander (Brasil) S.A.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 104,136 € 103,541 113,409  
Number of tranches | tranches 4      
Brazil | Retail Banking segment        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 37.00%      
Brazil | Retail Banking segment | Securitised mortgage assets        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 29.00%      
Brazil | Retail Banking segment | Credit cards        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 26.00%      
Financial instruments not credit-impaired | Stage 1        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 779,109 800,360 807,228  
Maximum exposure, financial instruments not included elsewhere 834,911 665,476 598,385  
Financial instruments not credit-impaired | Stage 1 | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 200,576 209,588 205,708  
Financial instruments not credit-impaired | Stage 1 | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Financial assets 196,509 196,514 176,697  
Financial instruments not credit-impaired | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 78,112 77,330 74,808  
Financial instruments not credit-impaired | Stage 2 and 3 | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 19,295 23,970 26,118  
Financial instruments not credit-impaired | Stage 2 and 3 | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Financial assets 1,480 597 203  
Financial instruments not credit-impaired | Other units | Stage 1        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 89,094 80,541 68,788  
Financial instruments not credit-impaired | Other units | Stage 1 | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (213) (165) (199)  
Financial instruments not credit-impaired | Other units | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 3,528 2,534 1,504  
Financial instruments not credit-impaired | Other units | Stage 2 and 3 | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (152) (117) (73)  
Financial instruments not credit-impaired | Spain | Stage 1        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 183,686 179,041 183,324  
Financial instruments not credit-impaired | Spain | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 11,566 13,277 15,134  
Financial instruments not credit-impaired | US | Stage 1 | Total North America | Santander Consumer USA Holdings Inc.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 13,798 20,263 18,973  
Financial instruments not credit-impaired | US | Stage 1 | Total North America | Santander Bank, National Association        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 38,511 47,569 50,666  
Financial instruments not credit-impaired | US | Stage 2 and 3 | Total North America | Santander Consumer USA Holdings Inc.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 5,818 4,677 4,632  
Financial instruments not credit-impaired | US | Stage 2 and 3 | Total North America | Santander Bank, National Association        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 6,072 5,544 4,424  
Financial instruments not credit-impaired | Brazil | Stage 1 | Total South America | Banco Santander (Brasil) S.A.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 83,383 86,459 96,799  
Financial instruments not credit-impaired | Brazil | Stage 2 and 3 | Total South America | Banco Santander (Brasil) S.A.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 13,602 10,700 9,131  
Financial instruments credit-impaired | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers (13,527)      
Financial instruments credit-impaired | Accumulated impairment | Of which property collateral        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers (1,759)      
Financial instruments credit-impaired | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 31,577      
Financial instruments credit-impaired | Gross carrying amount | Of which property collateral        
Disclosure of credit risk exposure [line items]        
Loans and advances to customers 7,777      
Financial instruments credit-impaired | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 31,275 31,273 32,455  
Financial instruments credit-impaired | Stage 2 and 3 | Santander UK plc        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 2,475 3,292 3,518  
Financial instruments credit-impaired | Stage 2 and 3 | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Financial assets 842 701 461  
Financial instruments credit-impaired | Other units | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 1,109 874 658  
Financial instruments credit-impaired | Other units | Stage 2 and 3 | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (394) (295) (161)  
Financial instruments credit-impaired | Spain | Stage 2 and 3        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 5,761 6,618 7,536  
Financial instruments credit-impaired | US | Stage 2 and 3 | Total North America | Santander Consumer USA Holdings Inc.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 5,588 5,729 5,272  
Financial instruments credit-impaired | US | Stage 2 and 3 | Total North America | Santander Bank, National Association        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 1,158 1,130 894  
Financial instruments credit-impaired | Brazil | Stage 2 and 3 | Total South America | Banco Santander (Brasil) S.A.        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk 7,151 6,382 7,479  
Financial instruments purchased credit impaired        
Disclosure of credit risk exposure [line items]        
Maximum exposure to credit risk € 334 € 559 € 743  
Credit risk        
Disclosure of credit risk exposure [line items]        
Number of credit risk categories | stage 3      
Risk exposure associated with instruments sharing characteristic € 1,792,549      
Non-performing rate 2.91% 3.03% 3.11%  
Coverage rate 66.00% 64.00% 66.00%  
Cost of credit (in percent) 1.14% 1.12% 1.13%  
Net loan-loss provisions € 12,128 € 11,822 € 11,784  
Credit risk | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Percentage of loans covered by specific allowance 26.00%      
Credit risk | "Large Exposures" Customers        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 5.30%      
Large exposure threshold percentage 10.00%      
Maximum percentage of eligible capital allowed under regulation 25.00%      
Credit risk | "Large Exposures" Customers, top 40        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 8.40%      
Credit risk | Credit impaired | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 53.00%      
Percentage of loans covered by specific allowance 41.00%      
Credit risk | Performing | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Credit exposure percentage 47.00%      
Credit risk | Of which property collateral | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Percentage of loans secured 47.00%      
Credit risk | Accumulated impairment | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Financial assets € (6,480)      
Credit risk | Accumulated impairment | Credit impaired | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Financial assets (5,508)      
Credit risk | Gross carrying amount | Of which property collateral | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Financial assets 15,484      
Credit risk | Gross carrying amount | Of which property collateral | Credit impaired | Forborne loan portfolio        
Disclosure of credit risk exposure [line items]        
Financial assets 7,980      
Credit risk | Spain        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 352,126      
Non-performing rate 1.94% 2.66% 3.04%  
Coverage rate 55.00% 53.00% 49.00%  
Cost of credit (in percent) 0.43% 0.50% 0.61%  
Net loan-loss provisions € 1,142 € 1,259 € 1,522  
Credit risk | US        
Disclosure of credit risk exposure [line items]        
Non-performing rate 4.82% 4.68% 4.57%  
Coverage rate 55.00% 64.00% 68.00%  
Cost of credit (in percent) 1.62% 1.82% 1.92%  
Net loan-loss provisions € 2,244 € 2,507 € 2,593  
Credit risk | Brazil        
Disclosure of credit risk exposure [line items]        
Non-performing rate 6.76% 6.10% 6.25%  
Coverage rate 81.00% 79.00% 83.00%  
Cost of credit (in percent) 4.17% 4.03% 4.27%  
Net loan-loss provisions € 4,409 € 4,487 € 4,701  
Local sovereign other than official currency risk        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 4,908      
Percentage of total sovereign risk 1.20%      
Non-local sovereign cross border risk        
Disclosure of credit risk exposure [line items]        
Risk exposure associated with instruments sharing characteristic € 17,002      
Percentage of total sovereign risk 4.00%