v3.26.1
Loans and advances to customers - Schedule of the breakdown of loans and advances to customers (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Loans And Advances To Customers [Line Items]      
Financial assets € 300,026 € 283,497 € 243,203
Gross carrying amount | Customers      
Loans And Advances To Customers [Line Items]      
Financial assets 1,058,446 1,076,194 1,059,137
Gross carrying amount | Customers | Fixed rate      
Loans And Advances To Customers [Line Items]      
Financial assets 694,332 678,994 647,349
Gross carrying amount | Customers | Floating rate      
Loans And Advances To Customers [Line Items]      
Financial assets 364,114 397,200 411,788
Gross carrying amount | Customers | Spain      
Loans And Advances To Customers [Line Items]      
Financial assets 198,894 198,164 203,680
Gross carrying amount | Customers | Rest of Europe      
Loans And Advances To Customers [Line Items]      
Financial assets 467,697 502,664 489,706
Gross carrying amount | Customers | United Kingdom      
Loans And Advances To Customers [Line Items]      
Financial assets 258,739 266,934 263,808
Gross carrying amount | Customers | America      
Loans And Advances To Customers [Line Items]      
Financial assets 374,739 359,264 350,873
Gross carrying amount | Customers | US      
Loans And Advances To Customers [Line Items]      
Financial assets 135,088 136,054 126,529
Gross carrying amount | Customers | Brazil      
Loans And Advances To Customers [Line Items]      
Financial assets 90,951 91,066 100,758
Gross carrying amount | Customers | Rest of the world      
Loans And Advances To Customers [Line Items]      
Financial assets 17,116 16,102 14,878
Gross carrying amount | Commercial credit      
Loans And Advances To Customers [Line Items]      
Financial assets 51,110 53,209 55,628
Gross carrying amount | Secured loans      
Loans And Advances To Customers [Line Items]      
Financial assets 530,749 557,463 554,375
Gross carrying amount | Reverse repurchase agreements      
Loans And Advances To Customers [Line Items]      
Financial assets 73,980 59,648 44,184
Gross carrying amount | Other term loans      
Loans And Advances To Customers [Line Items]      
Financial assets 295,998 296,339 295,485
Gross carrying amount | Finance leases      
Loans And Advances To Customers [Line Items]      
Financial assets 38,540 40,120 38,723
Gross carrying amount | Receivable on demand      
Loans And Advances To Customers [Line Items]      
Financial assets 10,313 10,756 12,277
Gross carrying amount | Credit cards receivables      
Loans And Advances To Customers [Line Items]      
Financial assets 26,179 24,928 24,371
Gross carrying amount | Impaired assets      
Loans And Advances To Customers [Line Items]      
Financial assets € 31,577 € 33,731 € 34,094