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Note 21 Deposits from debt certificates (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Debt certificates issued [Line Items]    
Debt certificates issued € 55,047,000,000 € 61,780,000,000
Issued in euros [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 34,878,000,000 42,462,000,000
Issued in euros [Member] | Promissory bills and notes [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 503,000,000 860,000,000
Issued in euros [Member] | Non convertible bonds and debentures [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 14,277,000,000 14,538,000,000
Issued in euros [Member] | Covered bons [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 9,900,000,000 13,274,000,000
Issued in euros [Member] | Hybrid financial instruments [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [1] 340,000,000 355,000,000
Issued in euros [Member] | Securilization bonds [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 2,306,000,000 2,538,000,000
Issued in euros [Member] | Wholesale funding [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 244,000,000 2,331,000,000
Issued in euros [Member] | Subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 7,307,000,000 8,566,000,000
Issued in euros [Member] | Convertible perpetual certificates [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 3,500,000,000 4,500,000,000
Issued in euros [Member] | Non convertible preferred stock [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 0 159,000,000
Issued in euros [Member] | Other non convertible subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 3,807,000,000 3,907,000,000
issued in foreign currency [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 20,169,000,000 19,318,000,000
issued in foreign currency [Member] | Promissory bills and notes [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 1,296,000,000 1,024,000,000
issued in foreign currency [Member] | Non convertible bonds and debentures [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 8,082,000,000 8,691,000,000
issued in foreign currency [Member] | Covered bons [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 212,000,000 217,000,000
issued in foreign currency [Member] | Hybrid financial instruments [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued [1] 1,843,000,000 455,000,000
issued in foreign currency [Member] | Securilization bonds [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 3,000,000 4,000,000
issued in foreign currency [Member] | Wholesale funding [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 1,366,000,000 1,016,000,000
issued in foreign currency [Member] | Subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 7,366,000,000 7,911,000,000
issued in foreign currency [Member] | Convertible perpetual certificates [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 1,687,000,000 1,633,000,000
issued in foreign currency [Member] | Non convertible preferred stock [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued 0 35,000,000
issued in foreign currency [Member] | Other non convertible subordinated liabilities [Member]    
Debt certificates issued [Line Items]    
Debt certificates issued € 5,678,000,000 € 6,243,000,000
[1]
((*) Corresponds to structured note issuance whose underlying risk is different from the underlying risk of the derivative.
Most of the foreign currency issues are denominated in U.S. dollars.