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Note 19 - Tax assets and liabilities - Reconciliation Of Deferred Tax - Assets (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes On The Exercise Assets [Line Items] |  |  |
Deferred tax assets at the beginning | € 16,391 | € 15,878 | € 10,391
Changes On The Exercise Assets Abstract |  |  |
Deferred tax assets at the end | 14,725 | 16,391 | 15,878
Pensions [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | (795) | 168 | 120
Portfolio [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | 82 | (103) | 554
Investments in subsidiaries [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | (305) | 108 | 19
Impairment Losses [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | (385) | 44 | 305
Other [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | (366) | 255 | 76
Secured Tax Assets [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | 2 | (105) | 4,655
Tax Losses [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | 101 | 146 | (242)
Charge For Income Tax And Other [Member] |  |  |
Changes On The Exercise Assets Abstract |  |  |
Changes On The Ejercice Assets | € 0 | € 0 | € 0

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_g_i&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_o&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_56&doctype=Standard -URIDate 2016-03-31 + Details
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