Note 14 - Held-to-maturity investments - Effect on Income Statement and Other Comprehensive Income (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
BBVA, S.A. [Member] \| Registered In [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect recognized in income statement "Reclassified to Loans and Advances"	€ 172	€ 230
BBVA, S.A. [Member] \| Non reclassified Impacts [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect of not reclassifying in income statement to "Loans and Advances"	172	230
Effect of not reclassifying in equity valuation adjustments to "Loans and Advances"	(18)	(86)
Garanti Turkiye Bankasi [Member] \| Registered In [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect recognized in income statement "Reclassified to Loans and Advances"	545	326
Garanti Turkiye Bankasi [Member] \| Non reclassified Impacts [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect of not reclassifying in income statement to "Loans and Advances"	545	326
Effect of not reclassifying in equity valuation adjustments to "Loans and Advances"	(16)	(225)
Total [Member] \| Registered In [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect recognized in income statement "Reclassified to Loans and Advances"	717	557
Total [Member] \| Non reclassified Impacts [Member]
Effect on Income Statement and other comprehensive income Line Items
Effect of not reclassifying in income statement to "Loans and Advances"	717	557
Effect of not reclassifying in equity valuation adjustments to "Loans and Advances"	€ (34)	€ (311)

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- Definition

The fair value gains (losses) that would have been recognised in other comprehensive income if financial assets had not been reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 12A
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_12A_e&doctype=Standard
-URIDate 2016-03-31

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- Definition

The fair value gains (losses) recognised in other comprehensive income on financial assets reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 12A
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_12A_d&doctype=Standard
-URIDate 2016-03-31

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- Definition

The gains (losses) recognised in profit or loss on financial assets reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income]

+ References

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