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Note 7 - Risk Management -Liquidity Risk - Asset Encumbrance (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Equity instruments [Member] | Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | € 2,297 | € 2,214
Equity instruments [Member] | Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 2,297 | 2,214
Equity instruments [Member] | Non Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 9,616 | 9,022
Equity instruments [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 9,616 | 9,022
Debt Securities [Member] | Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 28,700 | 40,114
Debt Securities [Member] | Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 29,798 | 39,972
Debt Securities [Member] | Non Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 84,391 | 90,679
Debt Securities [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 84,391 | 90,679
Loans and Other Assets [Member] | Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 79,604 | 94,718
Loans and Other Assets [Member] | Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 0 |
Loans and Other Assets [Member] | Non Encumbered Assets [Member] | Carriying Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | 485,451 | € 495,109
Loans and Other Assets [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member] |  |
Encumbered Assets Line Items |  |
Encumbered Assets | € 0 |

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_14_a&doctype=Standard -URIDate 2016-03-31 + Details
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