Note 33 - Dividend income (Details) - EUR (€) € in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Dividens Revenue Line Items
Dividend income	€ 84	€ 212
Financial assets at fair value through profit or loss classified as held for trading [Member]
Dividens Revenue Line Items
Dividend income		106
Financial Assets At Fair Value Through Other Comprehensive Income Member
Dividens Revenue Line Items
Dividend income	73	106
Other Assets [Member]
Dividens Revenue Line Items
Dividend income	11	0
Total [Member]
Dividens Revenue Line Items
Dividend income	€ 84	€ 212

The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IAS
-Number 18
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph b
-Clause v
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2017-03-02&anchor=para_35_b_v&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration