v3.26.1
Risk management - Schedule of exposure to risk, Spain real estate business (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]        
Financial assets € 300,026 € 283,497 € 243,203  
Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (520) (349) (286)  
Spain        
Disclosure of credit risk exposure [line items]        
Excess of gross exposure over maximum recoverable amount of effective collateral 305,156      
Spain | Accumulated impairment        
Disclosure of credit risk exposure [line items]        
Financial assets (1,086)      
Spain | Real estate operations in Spain | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984      
Spain | Real estate operations in Spain | Construction and property development        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984 € 2,545 € 2,433 € 2,327
Excess of gross exposure over maximum recoverable amount of effective collateral 211      
Spain | Real estate operations in Spain | Construction and property development | Credit impaired        
Disclosure of credit risk exposure [line items]        
Excess of gross exposure over maximum recoverable amount of effective collateral 0      
Spain | Real estate operations in Spain | Construction and property development | Gross carrying amount        
Disclosure of credit risk exposure [line items]        
Financial assets 2,984      
Spain | Real estate operations in Spain | Construction and property development | Gross carrying amount | Credit impaired        
Disclosure of credit risk exposure [line items]        
Financial assets 31      
Written-off assets 240      
Spain | Real estate operations in Spain | Construction and property development | Accumulated impairment | Individually calculated        
Disclosure of credit risk exposure [line items]        
Financial assets (17)      
Spain | Real estate operations in Spain | Construction and property development | Accumulated impairment | Credit impaired | Individually calculated        
Disclosure of credit risk exposure [line items]        
Financial assets € (11)