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Note 14 - Financial assets at amortised cost- Debt Securities (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Loans And Receivables Debt Securities Line Items |  |  |
Impairment loss | € 208 | € 158 | € 136
General Government [Member] |  |  |
Disclosure Of Loans And Receivables Debt Securities Line Items |  |  |
Total Gross Debt Securities | 25,014 | 17,030 | 20,736
Credit Institutions [Member] |  |  |
Disclosure Of Loans And Receivables Debt Securities Line Items |  |  |
Total Gross Debt Securities | 644 | 1,152 | 1,688
Other Issuers [Member] |  |  |
Disclosure Of Loans And Receivables Debt Securities Line Items |  |  |
Total Gross Debt Securities | 6,872 | 5,911 | 6,481
Total [Member] |  |  |
Disclosure Of Loans And Receivables Debt Securities Line Items |  |  |
Total Gross Debt Securities | 32,530 | 24,093 | 28,905
Impairment loss | € (51) | € (15) | € (17)

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