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Note 22 Deposits from debt certificates (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt certificates issued [Line Items]      
Debt certificates issued € 55,429 € 55,763 € 61,780
Issued in euros [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 35,611 36,289 42,462
Issued in euros [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 1,079 319 860
Issued in euros [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 16,979 15,712 14,538
Issued in euros [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [1] 7,665 9,930 13,274
Issued in euros [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [2] 959 366 355
Issued in euros [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 2,501 2,302 2,538
Issued in euros [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 139 438 2,331
Issued in euros [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 6,289 7,221 8,566
Issued in euros [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 3,000 3,500 4,500
Issued in euros [Member] | Non convertible preferred stock [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 0 0 159
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 3,289 3,721 3,907
issued in foreign currency [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 19,819 19,475 19,318
issued in foreign currency [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 351 579 1,024
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 9,323 7,885 8,691
issued in foreign currency [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [1] 114 178 217
issued in foreign currency [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [2] 3,724 2,843 455
issued in foreign currency [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 0 4 4
issued in foreign currency [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 111 412 1,016
issued in foreign currency [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 6,196 7,574 7,911
issued in foreign currency [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 1,876 1,771 1,633
issued in foreign currency [Member] | Non convertible preferred stock [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 0 0 35
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued € 4,320 € 5,803 € 6,243
[1] (1) Including mortgage-covered bonds. In years 2022, 2021 and 2020 there were several maturities of mortgage bonds.
[2] (2) Corresponds to structured note issuances with embedded derivatives that have been segregated according to IFRS 9.