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Note 22 Deposits from debt certificates (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt certificates issued [Line Items]      
Debt certificates issued € 55,763 € 61,780 € 63,963
Issued in euros [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 36,289 42,462 40,185
Issued in euros [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 319 860 737
Issued in euros [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 15,712 14,538 12,248
Issued in euros [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [1] 9,930 13,274 15,542
Issued in euros [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [2] 366 355 518
Issued in euros [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 2,302 2,538 1,354
Issued in euros [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 438 2,331 1,817
Issued in euros [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 7,221 8,566 7,968
Issued in euros [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 3,500 4,500 5,000
Issued in euros [Member] | Non convertible preferred stock [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 0 159 83
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 3,721 3,907 2,885
issued in foreign currency [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 19,475 19,318 23,778
issued in foreign currency [Member] | Promissory bills and notes [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 579 1,024 1,210
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 7,885 8,691 10,587
issued in foreign currency [Member] | Covered bons [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [1] 178 217 362
issued in foreign currency [Member] | Hybrid financial instruments [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued [2] 2,843 455 1,156
issued in foreign currency [Member] | Securilization bonds [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 4 4 17
issued in foreign currency [Member] | Wholesale funding [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 412 1,016 780
issued in foreign currency [Member] | Subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 7,574 7,911 9,666
issued in foreign currency [Member] | Convertible perpetual certificates [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 1,771 1,633 1,782
issued in foreign currency [Member] | Non convertible preferred stock [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued 0 35 76
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]      
Debt certificates issued [Line Items]      
Debt certificates issued € 5,803 € 6,243 € 7,808
[1] (*) Including mortgage-covered bonds. In 2021 and 2020, several mortgage-covered bonds reached their maturity date.
[2] (**) Corresponds to structured note issuances whose underlying risk is different from the underlying risk of the derivative.