v3.25.4
Note 22 Deposits from debt certificates (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost € 81,842 € 69,867 € 68,707
Issued in euros [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 42,070 37,118 44,622
Issued in euros [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 5,379 1,360 5,416
Issued in euros [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 15,860 17,788 16,256
Issued in euros [Member] | Covered bonds [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 3,371 5,825 6,734
Issued in euros [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost [1] 1,160 519 800
Issued in euros [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 3,203 2,201 2,168
Issued in euros [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 3,688 1,030 6,182
Issued in euros [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 9,409 8,395 7,066
Issued in euros [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 3,750 2,750 3,000
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 5,659 5,645 4,066
issued in foreign currency [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 39,773 32,748 24,086
issued in foreign currency [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,781 2,962 336
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 13,302 12,136 8,684
issued in foreign currency [Member] | Covered bonds [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 94 95 99
issued in foreign currency [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost [1] 7,914 5,327 4,722
issued in foreign currency [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 0 0 0
issued in foreign currency [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 4,142 1,067 1,479
issued in foreign currency [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 11,540 11,161 8,766
issued in foreign currency [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,553 2,888 2,715
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost € 8,986 € 8,273 € 6,051
[1]
(1) Corresponds to structured note issuances with embedded derivatives that have been segregated according to IFRS 9.