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Note 22 - Financial liabilities at amortized cost - Debt Securities issued (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt securities issued Line Items      
Debt certificates, at amortized cost € 61,780,000,000 € 63,963,000,000 € 61,112,000,000
Issued in Euros [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 42,462,000,000 40,185,000,000 37,436,000,000
Issued in Euros [Member] | Promissory bills and notes      
Debt securities issued Line Items      
Debt certificates, at amortized cost 860,000,000 737,000,000 267,000,000
Issued in Euros [Member] | Non-convertible bonds and debentures at floating interest rates      
Debt securities issued Line Items      
Debt certificates, at amortized cost 14,538,000,000 12,248,000,000 9,638,000,000
Issued in Euros [Member] | Mortgage Covered bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost [1] 13,274,000,000 15,542,000,000 15,809,000,000
Issued in Euros [Member] | Hybrid financial instruments      
Debt securities issued Line Items      
Debt certificates, at amortized cost [2] 355,000,000 518,000,000 814,000,000
Issued in Euros [Member] | Securitization bonds made by the Group      
Debt securities issued Line Items      
Debt certificates, at amortized cost 2,538,000,000 1,354,000,000 1,630,000,000
Issued in Euros [Member] | Certified Deposits [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 2,331,000,000 1,817,000,000 142,000,000
Issued in Euros [Member] | Subordinated Liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 8,566,000,000 7,968,000,000 9,136,000,000
Issued in Euros [Member] | Convertible perpetual securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 4,500,000,000 5,000,000,000 5,490,000,000
Issued in Euros [Member] | Convertible subordinated bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost 0 0 0
Issued in Euros [Member] | Non convertible preferred liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 159,000,000 83,000,000 107,000,000
Issued in Euros [Member] | Non convertible other subordinated liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 3,907,000,000 2,885,000,000 3,540,000,000
Issued in Foreign Currency [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 19,318,000,000 23,778,000,000 23,676,000,000
Issued in Foreign Currency [Member] | Promissory bills and notes      
Debt securities issued Line Items      
Debt certificates, at amortized cost 1,024,000,000 1,210,000,000 3,237,000,000
Issued in Foreign Currency [Member] | Non-convertible bonds and debentures at floating interest rates      
Debt securities issued Line Items      
Debt certificates, at amortized cost 8,691,000,000 10,587,000,000 9,335,000,000
Issued in Foreign Currency [Member] | Mortgage Covered bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost [1] 217,000,000 362,000,000 569,000,000
Issued in Foreign Currency [Member] | Hybrid financial instruments      
Debt securities issued Line Items      
Debt certificates, at amortized cost [2] 455,000,000 1,156,000,000 1,455,000,000
Issued in Foreign Currency [Member] | Securitization bonds made by the Group      
Debt securities issued Line Items      
Debt certificates, at amortized cost 4,000,000 17,000,000 38,000,000
Issued in Foreign Currency [Member] | Certified Deposits [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 1,016,000,000 780,000,000 544,000,000
Issued in Foreign Currency [Member] | Subordinated Liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 7,911,000,000 9,666,000,000 8,499,000,000
Issued in Foreign Currency [Member] | Convertible perpetual securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 1,633,000,000 1,782,000,000 873,000,000
Issued in Foreign Currency [Member] | Convertible subordinated bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost 0 0 0
Issued in Foreign Currency [Member] | Non convertible preferred liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 35,000,000 76,000,000 74,000,000
Issued in Foreign Currency [Member] | Non convertible other subordinated liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 6,243,000,000 7,808,000,000 7,552,000,000
Total Member | Total Member      
Debt securities issued Line Items      
Debt certificates, at amortized cost € 61,780,000,000 € 63,963,000,000 € 61,112,000,000
[1]

(*) Including mortgage -covered bonds .

[2]

(**) Corresponds to the issuance of structured notes whose underlying risk differs from the underlying risk of the derivative.