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Note 21 - Financial liabilities at amortized cost - Debt Securities issued (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Debt securities issued Line Items    
Debt certificates, at amortized cost € 64,421,000,000 € 63,963,000,000
Issued in Euros [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 42,329,000,000 40,185,000,000
Issued in Euros [Member] | Promissory bills and notes    
Debt securities issued Line Items    
Debt certificates, at amortized cost 718,000,000 737,000,000
Issued in Euros [Member] | Non-convertible bonds and debentures at floating interest rates    
Debt securities issued Line Items    
Debt certificates, at amortized cost 14,472,000,000 12,248,000,000
Issued in Euros [Member] | Mortgage Covered bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 15,232,000,000 15,542,000,000
Issued in Euros [Member] | Hybrid financial instruments    
Debt securities issued Line Items    
Debt certificates, at amortized cost 405,000,000 518,000,000
Issued in Euros [Member] | Securitization bonds made by the Group    
Debt securities issued Line Items    
Debt certificates, at amortized cost 2,900,000,000 1,354,000,000
Issued in Euros [Member] | Certified Deposits [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 1,132,000,000 1,817,000,000
Issued in Euros [Member] | Subordinated Liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 7,470,000,000 7,968,000,000
Issued in Euros [Member] | Convertible perpetual securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 3,500,000,000 5,000,000,000
Issued in Euros [Member] | Convertible subordinated bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Euros [Member] | Non convertible preferred liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 79,000,000 83,000,000
Issued in Euros [Member] | Non convertible other subordinated liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 3,891,000,000 2,885,000,000
Issued in Foreign Currency [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 22,092,000,000 23,778,000,000
Issued in Foreign Currency [Member] | Promissory bills and notes    
Debt securities issued Line Items    
Debt certificates, at amortized cost 1,059,000,000 1,210,000,000
Issued in Foreign Currency [Member] | Non-convertible bonds and debentures at floating interest rates    
Debt securities issued Line Items    
Debt certificates, at amortized cost 10,364,000,000 10,587,000,000
Issued in Foreign Currency [Member] | Mortgage Covered bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 279,000,000 362,000,000
Issued in Foreign Currency [Member] | Hybrid financial instruments    
Debt securities issued Line Items    
Debt certificates, at amortized cost 656,000,000 1,156,000,000
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
Issued in Foreign Currency [Member] | Certified Deposits [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 512,000,000 780,000,000
Issued in Foreign Currency [Member] | Subordinated Liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 9,218,000,000 9,666,000,000
Issued in Foreign Currency [Member] | Convertible perpetual securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 1,788,000,000 1,782,000,000
Issued in Foreign Currency [Member] | Convertible subordinated bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Foreign Currency [Member] | Non convertible preferred liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 53,000,000 76,000,000
Issued in Foreign Currency [Member] | Non convertible other subordinated liabilities [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost € 7,377,000,000 € 7,808,000,000