v3.26.1
Risk management - Schedule of exposure to risk, Spain foreclosed properties (Details) - Spain - Foreclosed properties - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets foreclosed      
Loans and advances to customers € 1,898 € 2,131 € 2,448
Changes in property loans      
Gross additions 100 100 300
Disposals (700) (800) (1,200)
Difference (600) (700) (900)
Construction and property development      
Assets foreclosed      
Loans and advances to customers 1,699    
Completed buildings      
Assets foreclosed      
Loans and advances to customers 157    
Completed buildings | Residential      
Assets foreclosed      
Loans and advances to customers 58    
Completed buildings | Other      
Assets foreclosed      
Loans and advances to customers 99    
Buildings under construction      
Assets foreclosed      
Loans and advances to customers 58    
Buildings under construction | Residential      
Assets foreclosed      
Loans and advances to customers 0    
Buildings under construction | Other      
Assets foreclosed      
Loans and advances to customers 58    
Land      
Assets foreclosed      
Loans and advances to customers 1,484    
Land | Developed land      
Assets foreclosed      
Loans and advances to customers 347    
Land | Other land      
Assets foreclosed      
Loans and advances to customers 1,137    
Property assets from home purchase mortgage loans to households      
Assets foreclosed      
Loans and advances to customers 162    
Other foreclosed property assets      
Assets foreclosed      
Loans and advances to customers 37    
Gross carrying amount      
Assets foreclosed      
Loans and advances to customers 4,258 4,823 5,506
Gross carrying amount | Construction and property development      
Assets foreclosed      
Loans and advances to customers 3,843    
Gross carrying amount | Completed buildings      
Assets foreclosed      
Loans and advances to customers 481    
Gross carrying amount | Completed buildings | Residential      
Assets foreclosed      
Loans and advances to customers 129    
Gross carrying amount | Completed buildings | Other      
Assets foreclosed      
Loans and advances to customers 352    
Gross carrying amount | Buildings under construction      
Assets foreclosed      
Loans and advances to customers 107    
Gross carrying amount | Buildings under construction | Residential      
Assets foreclosed      
Loans and advances to customers 0    
Gross carrying amount | Buildings under construction | Other      
Assets foreclosed      
Loans and advances to customers 107    
Gross carrying amount | Land      
Assets foreclosed      
Loans and advances to customers 3,255    
Gross carrying amount | Land | Developed land      
Assets foreclosed      
Loans and advances to customers 776    
Gross carrying amount | Land | Other land      
Assets foreclosed      
Loans and advances to customers 2,479    
Gross carrying amount | Property assets from home purchase mortgage loans to households      
Assets foreclosed      
Loans and advances to customers 334    
Gross carrying amount | Other foreclosed property assets      
Assets foreclosed      
Loans and advances to customers 81    
Accumulated impairment      
Assets foreclosed      
Loans and advances to customers 2,360 € 2,692 € 3,058
Accumulated impairment | Construction and property development      
Assets foreclosed      
Loans and advances to customers 2,144    
Accumulated impairment | Completed buildings      
Assets foreclosed      
Loans and advances to customers 324    
Accumulated impairment | Completed buildings | Residential      
Assets foreclosed      
Loans and advances to customers 71    
Accumulated impairment | Completed buildings | Other      
Assets foreclosed      
Loans and advances to customers 253    
Accumulated impairment | Buildings under construction      
Assets foreclosed      
Loans and advances to customers 49    
Accumulated impairment | Buildings under construction | Residential      
Assets foreclosed      
Loans and advances to customers 0    
Accumulated impairment | Buildings under construction | Other      
Assets foreclosed      
Loans and advances to customers 49    
Accumulated impairment | Land      
Assets foreclosed      
Loans and advances to customers 1,771    
Accumulated impairment | Land | Developed land      
Assets foreclosed      
Loans and advances to customers 429    
Accumulated impairment | Land | Other land      
Assets foreclosed      
Loans and advances to customers 1,342    
Accumulated impairment | Property assets from home purchase mortgage loans to households      
Assets foreclosed      
Loans and advances to customers 172    
Accumulated impairment | Other foreclosed property assets      
Assets foreclosed      
Loans and advances to customers 44    
Impairment losses since time of foreclosure      
Assets foreclosed      
Loans and advances to customers 1,746    
Impairment losses since time of foreclosure | Construction and property development      
Assets foreclosed      
Loans and advances to customers 1,591    
Impairment losses since time of foreclosure | Completed buildings      
Assets foreclosed      
Loans and advances to customers 282    
Impairment losses since time of foreclosure | Completed buildings | Residential      
Assets foreclosed      
Loans and advances to customers 60    
Impairment losses since time of foreclosure | Completed buildings | Other      
Assets foreclosed      
Loans and advances to customers 222    
Impairment losses since time of foreclosure | Buildings under construction      
Assets foreclosed      
Loans and advances to customers 35    
Impairment losses since time of foreclosure | Buildings under construction | Residential      
Assets foreclosed      
Loans and advances to customers 0    
Impairment losses since time of foreclosure | Buildings under construction | Other      
Assets foreclosed      
Loans and advances to customers 35    
Impairment losses since time of foreclosure | Land      
Assets foreclosed      
Loans and advances to customers 1,274    
Impairment losses since time of foreclosure | Land | Developed land      
Assets foreclosed      
Loans and advances to customers 260    
Impairment losses since time of foreclosure | Land | Other land      
Assets foreclosed      
Loans and advances to customers 1,014    
Impairment losses since time of foreclosure | Property assets from home purchase mortgage loans to households      
Assets foreclosed      
Loans and advances to customers 119    
Impairment losses since time of foreclosure | Other foreclosed property assets      
Assets foreclosed      
Loans and advances to customers € 36