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Note 10 - Financial assets and liabilities held for trading. Financial assets held for trading Loans and Advances (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Assets Held for Trading Loans and Advances LineItems      
Loans and Advances to Central Banks Held for Trading € 2,163 € 0 € 0
Loans And Advances To Banks Held For Trading 14,566 0 0
Loans and receivables Held For Trading 12,021 56 154
Financial Assets Held For Trading 90,117 64,695 74,950
Total [Member]      
Financial Assets Held for Trading Loans and Advances LineItems      
Loans and Advances to Central Banks Held for Trading 2,163 0 0
Loans And Advances To Banks Held For Trading 14,566 0 0
Loans and receivables Held For Trading 12,021 56 154
Financial Assets Held For Trading 28,750 56 154
Reverse Repurchase Agreements [Member]      
Financial Assets Held for Trading Loans and Advances LineItems      
Loans and Advances to Central Banks Held for Trading 2,163 0 0
Loans And Advances To Banks Held For Trading 13,305 0 0
Loans and receivables Held For Trading € 11,794 € 0 € 0