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Note 19 - Tax assets and liabilities - Tax recognized in total equity (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Securities [Member] |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | € (355) | € (533) | € (593)
Equity instruments [Member] |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | (74) | (2) | 113
Subtotal [Member] |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | (429) | (535) | (480)
Total [Member] |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | € (429) | € (535) | € (480)

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- Definition The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_a&doctype=Standard -URIDate 2016-03-31 + Details
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