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Note 10 - Financial assets and liabilities held for trading - Derivatives by type of risk by product or by type of market (Details) - EUR (€)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading € 33,185,000,000 € 30,536,000,000 € 35,265,000,000
Derivative financial liabilities, held for trading 35,019,000,000 31,815,000,000 36,169,000,000
Interest Rate Risk Member | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 21,479,000,000 19,146,000,000 22,606,000,000
Derivative financial liabilities, held for trading 20,852,000,000 18,769,000,000 22,546,000,000
Notional Amount 2,997,443,000,000 2,910,016,000,000 2,129,474,000,000
Interest Rate Risk Member | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 0
Derivative financial liabilities, held for trading 1,000,000 0 0
Notional Amount 27,351,000,000 19,355,000,000 23,016,000,000
Interest Rate Risk Member | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 21,479,000,000 19,146,000,000 22,606,000,000
Derivative financial liabilities, held for trading 20,853,000,000 18,769,000,000 22,546,000,000
Notional Amount 3,024,794,000,000 2,929,371,000,000 2,152,490,000,000
Equity Risk [Member] | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 353,000,000 631,000,000 578,000,000
Derivative financial liabilities, held for trading 1,435,000,000 463,000,000 1,207,000,000
Notional Amount 40,507,000,000 39,599,000,000 42,298,000,000
Equity Risk [Member] | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 1,910,000,000 2,168,000,000 1,200,000,000
Derivative financial liabilities, held for trading 2,065,000,000 2,492,000,000 1,129,000,000
Notional Amount 43,633,000,000 74,586,000,000 53,275,000,000
Equity Risk [Member] | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 2,263,000,000 2,799,000,000 1,778,000,000
Derivative financial liabilities, held for trading 3,499,000,000 2,956,000,000 2,336,000,000
Notional Amount 84,140,000,000 114,184,000,000 95,573,000,000
Foreign Exchange And Gold Risk [Member] | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 9,049,000,000 8,344,000,000 10,337,000,000
Derivative financial liabilities, held for trading 10,260,000,000 9,638,000,000 10,688,000,000
Notional Amount 463,662,000,000 426,952,000,000 373,303,000,000
Foreign Exchange And Gold Risk [Member] | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 37,000,000 11,000,000 34,000,000
Derivative financial liabilities, held for trading 6,000,000 55,000,000 40,000,000
Notional Amount 8,532,000,000 5,331,000,000 7,101,000,000
Foreign Exchange And Gold Risk [Member] | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 9,086,000,000 8,355,000,000 10,371,000,000
Derivative financial liabilities, held for trading 10,266,000,000 9,693,000,000 10,729,000,000
Notional Amount 472,194,000,000 432,283,000,000 380,404,000,000
Credit Risk Member | Credit Default Swap [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 338,000,000 228,000,000 480,000,000
Derivative financial liabilities, held for trading 283,000,000 248,000,000 507,000,000
Notional Amount 26,702,000,000 22,791,000,000 27,942,000,000
Credit Risk Member | Credit Spread Option [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 2,000,000 0
Derivative financial liabilities, held for trading 2,000,000 0 0
Notional Amount 150,000,000 500,000,000 200,000,000
Credit Risk Member | Total Return Swap [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 14,000,000 2,000,000 9,000,000
Derivative financial liabilities, held for trading 113,000,000 145,000,000 9,000,000
Notional Amount 2,225,000,000 2,161,000,000 2,039,000,000
Credit Risk Member | Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 0
Derivative financial liabilities, held for trading 0 0 0
Notional Amount 0 0 0
Credit Risk Member | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 353,000,000 232,000,000 489,000,000
Derivative financial liabilities, held for trading 397,000,000 393,000,000 517,000,000
Notional Amount 29,077,000,000 25,452,000,000 30,181,000,000
Commodities Risk [Member] | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 4,000,000 3,000,000 3,000,000
Derivative financial liabilities, held for trading 4,000,000 3,000,000 3,000,000
Notional Amount 64,000,000 67,000,000 36,000,000
Other Risk [Member] | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 18,000,000
Derivative financial liabilities, held for trading 0 0 38,000,000
Notional Amount 0 0 561,000,000
Derivates [Member] | Of Which OTC Derivatives With Credit Institutions [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 20,706,000,000 16,979,000,000 21,016,000,000
Derivative financial liabilities, held for trading 23,717,000,000 18,729,000,000 22,804,000,000
Notional Amount 1,000,243,000,000 897,384,000,000 898,209,000,000
Derivates [Member] | Of Which OTC Derivatives With Other Financial Institutions [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 6,153,000,000 7,372,000,000 8,695,000,000
Derivative financial liabilities, held for trading 6,214,000,000 7,758,000,000 9,207,000,000
Notional Amount 2,370,988,000,000 2,355,784,000,000 1,548,919,000,000
Derivates [Member] | Of Which OTC Derivatives With Rest Of Counterparties [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 4,378,000,000 4,005,000,000 4,316,000,000
Derivative financial liabilities, held for trading 3,016,000,000 2,780,000,000 2,986,000,000
Notional Amount 159,521,000,000 148,917,000,000 128,722,000,000
Derivates [Member] | Total Member      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 33,185,000,000 30,536,000,000 35,265,000,000
Derivative financial liabilities, held for trading 35,019,000,000 31,815,000,000 36,169,000,000
Notional Amount € 3,610,269,000,000 € 3,501,358,000,000 € 2,659,246,000,000