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Note 21 Debt certificates (Details) - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt certificates issued [Line Items]    
Debt certificates issued € 54,757 € 55,763
Issued in euros [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 33,287 36,289
Issued in euros [Member] | Promissory bills and notes [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 269 319
Issued in euros [Member] | Non convertible bonds and debentures [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 15,442 15,712
Issued in euros [Member] | Covered bons [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [1] 7,856 9,930
Issued in euros [Member] | Hybrid financial instruments [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [2] 406 366
Issued in euros [Member] | Securilization bonds [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 2,912 2,302
Issued in euros [Member] | Wholesale funding [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 30 438
Issued in euros [Member] | Subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 6,372 7,221
Issued in euros [Member] | Convertible perpetual certificates [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 3,000 3,500
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 3,372 3,721
issued in foreign currency [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 21,470 19,475
issued in foreign currency [Member] | Promissory bills and notes [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 592 579
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 8,488 7,885
issued in foreign currency [Member] | Covered bons [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [1] 140 178
issued in foreign currency [Member] | Hybrid financial instruments [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [2] 4,010 2,843
issued in foreign currency [Member] | Securilization bonds [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 0 4
issued in foreign currency [Member] | Wholesale funding [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 264 412
issued in foreign currency [Member] | Subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 7,977 7,574
issued in foreign currency [Member] | Convertible perpetual certificates [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 1,927 1,771
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued € 6,050 € 5,803
[1] (*) Including mortgage-covered bonds.
[2] (**) Corresponds to structured note issuance with embedded derivatives that have been segregated according to IFRS 9