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Note 37 - Interest Income and Expense Average Return On Investments And Average Borrowing Cost Assets (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Average Return On Investments Assets Line Items
Interest Income (Income Statement)	€ 29,831	€ 29,296	€ 27,708
Cash And Balances With Central Banks And Other Demand Deposits [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	42,730	33,917	26,209
Interest Income (Income Statement)	€ 135	€ 83	€ 10
Return On Investment Average Interest Rate Percentage	0.32	0.25	0.04
Securities Portfolio And Derivatives [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 179,672	€ 177,164	€ 202,388
Interest Income (Income Statement)	€ 5,707	€ 4,724	€ 5,072
Return On Investment Average Interest Rate Percentage	3.18	2.67	2.51
Loans And Advances To Central Banks [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 5,518	€ 10,945	€ 15,326
Interest Income (Income Statement)	€ 258	€ 258	€ 229
Return On Investment Average Interest Rate Percentage	4.67	2.36	1.50
Loans And Advances To Credit Institutions [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 25,634	€ 26,420	€ 28,078
Interest Income (Income Statement)	€ 657	€ 485	€ 218
Return On Investment Average Interest Rate Percentage	2.56	1.83	0.78
Loans And Advances To Customer [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 378,996	€ 407,153	€ 410,895
Interest Income (Income Statement)	€ 22,804	€ 23,261	€ 21,853
Return On Investment Average Interest Rate Percentage	6.02	5.71	5.32
Loans And Advances To Customers Euros [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 181,668	€ 196,893	€ 201,967
Interest Income (Income Statement)	€ 3,381	€ 3,449	€ 3,750
Return On Investment Average Interest Rate Percentage	1.86	1.75	1.86
Loans And Advances To Customers Foreign Currency [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 197,328	€ 210,261	€ 208,928
Interest Income (Income Statement)	€ 19,423	€ 19,812	€ 18,104
Return On Investment Average Interest Rate Percentage	9.84	9.42	8.67
Other Assets [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 46,343	€ 48,872	€ 52,748
Interest Income (Income Statement)	€ 270	€ 485	€ 325
Return On Investment Average Interest Rate Percentage	0.58	0.99	0.62
Total [Member]
Average Return On Investments Assets Line Items
Return On Investment Average Balance	€ 678,893	€ 704,471	€ 735,645
Interest Income (Income Statement)	€ 29,831	€ 29,296	€ 27,708
Return On Investment Average Interest Rate Percentage	4.39	4.16	3.77

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2018-01-01
-Paragraph 23
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_c&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2018-01-01
-Paragraph 28
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph B13
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_e&doctype=Appendix&seq=2
-URIDate 2018-03-16

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
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