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Note 22 Deposits from debt certificates (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost € 69,867 € 68,707 € 55,429 [1],[2]
Issued in euros [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 37,118 44,622 35,611
Issued in euros [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 1,360 5,416 1,079
Issued in euros [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 17,788 16,256 16,979
Issued in euros [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 5,825 6,734 7,665
Issued in euros [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost [3] 519 800 959
Issued in euros [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,201 2,168 2,501
Issued in euros [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 1,030 6,182 139
Issued in euros [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 8,395 7,066 6,289
Issued in euros [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,750 3,000 3,000
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 5,645 4,066 3,289
issued in foreign currency [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 32,748 24,086 19,819
issued in foreign currency [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,962 336 351
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 12,136 8,684 9,323
issued in foreign currency [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 95 99 114
issued in foreign currency [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost [3] 5,327 4,722 3,724
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 1,067 1,479 111
issued in foreign currency [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 11,161 8,766 6,196
issued in foreign currency [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost 2,888 2,715 1,876
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt instruments issued at amortised cost € 8,273 € 6,051 € 4,320
[1]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).
[2]
(1) Balances corresponding to 2022 have been restated according to IFRS 17 (see Note 1.3).
[3]
(1) Corresponds to structured note issuances with embedded derivatives that have been segregated according to IFRS 9.