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Note 35 - Purchase and sale commitments and future payment obligations- Purchase and sale commitments (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total [Member] | Financial Liabilities Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements € 36,815 € 0 € 0
Total [Member] | Financial liabilities at amortized cost [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 6,178 40,077 46,562
Total [Member] | Financial Assets Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 27,262 0 0
Total [Member] | Financial Assets At Amortised Cost Member      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 772 26,368 22,921
Total [Member] | Total [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 42,993 40,077 46,562
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 28,034 26,368 22,921
Central Banks [Member] | Financial Liabilities Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 10,511 0 0
Central Banks [Member] | Financial liabilities at amortized cost [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 375 6,155 4,649
Central Banks [Member] | Financial Assets Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 2,163 0 0
Central Banks [Member] | Financial Assets At Amortised Cost Member      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 0 305 81
Credit Institutions [Member] | Financial Liabilities Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 14,839 0 0
Credit Institutions [Member] | Financial liabilities at amortized cost [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 4,593 24,843 28,421
Credit Institutions [Member] | Financial Assets Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 13,305 0 0
Credit Institutions [Member] | Financial Assets At Amortised Cost Member      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 478 13,861 15,561
General Government [Member] | Financial Liabilities Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements 11,466 0 0
General Government [Member] | Financial Assets Held For Trading [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 11,794 0 0
General Government [Member] | Financial Assets At Amortised Cost Member      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Reverse Repurchase Agreements And Cash Collateral On Securities Borrowed 294 12,202 7,279
Customer Deposits [Member] | Financial liabilities at amortized cost [Member]      
Disclosure Of Purchase And Sale Commitments And Future Payment Obligations Line Items      
Repurchase Agreements € 1,209 € 9,079 € 13,491