v3.26.1
Other disclosures - Disclosure of concentration of portfolio (Details) - Of which: Financing for constructions and property development - Spain - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of credit risk exposure [line items]    
Financial assets € 3,157 € 2,967
Gross carrying amount    
Disclosure of credit risk exposure [line items]    
Financial assets 3,172 2,984
Without collateral | Gross carrying amount    
Disclosure of credit risk exposure [line items]    
Financial assets 15 14
With collateral | Gross carrying amount    
Disclosure of credit risk exposure [line items]    
Financial assets 3,157 2,970
With collateral | Gross carrying amount | Completed buildings    
Disclosure of credit risk exposure [line items]    
Financial assets 1,092 976
With collateral | Gross carrying amount | Building and other constructions under construction    
Disclosure of credit risk exposure [line items]    
Financial assets 2,053 1,981
With collateral | Gross carrying amount | Land    
Disclosure of credit risk exposure [line items]    
Financial assets 12 13
Residential | Gross carrying amount | Completed buildings    
Disclosure of credit risk exposure [line items]    
Financial assets 982 658
Residential | Gross carrying amount | Building and other constructions under construction    
Disclosure of credit risk exposure [line items]    
Financial assets 1,953 1,913
Other | Gross carrying amount | Completed buildings    
Disclosure of credit risk exposure [line items]    
Financial assets 110 318
Other | Gross carrying amount | Building and other constructions under construction    
Disclosure of credit risk exposure [line items]    
Financial assets 100 68
Developed consolidated land | Gross carrying amount | Land    
Disclosure of credit risk exposure [line items]    
Financial assets 9 9
Other land | Gross carrying amount | Land    
Disclosure of credit risk exposure [line items]    
Financial assets € 3 € 4