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Note 12 - Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Issued in Euros [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets € 20,478 € 22,765
Unrealized Gains debt securities available for sale financial assets 869 791
Unrealized losses debt securities available for sale financial assets (2) (17)
Subtotal Debt securities, available-for-sale 21,346 23,539
Issued in Euros [Member] | Other [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,673 1,951
Unrealized Gains debt securities available for sale financial assets 105 114
Unrealized losses debt securities available for sale financial assets (2) 0
Subtotal Debt securities, available-for-sale 1,777 2,066
Issued in Euros [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 0 0
Unrealized Gains debt securities available for sale financial assets 0 0
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 0 0
Issued in Euros [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 817 891
Unrealized Gains debt securities available for sale financial assets 67 72
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 884 962
Issued in Euros [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 856 1,061
Unrealized Gains debt securities available for sale financial assets 38 43
Unrealized losses debt securities available for sale financial assets (2) 0
Subtotal Debt securities, available-for-sale 893 1,103
Total domestic [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 22,151 24,716
Unrealized Gains debt securities available for sale financial assets 975 906
Unrealized losses debt securities available for sale financial assets (3) (17)
Subtotal Debt securities, available-for-sale 23,122 25,605
Total foreign [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 37,799 40,557
Unrealized Gains debt securities available for sale financial assets 407 661
Unrealized losses debt securities available for sale financial assets (729) (572)
Subtotal Debt securities, available-for-sale 37,478 40,647
Mexico [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 6,966 9,755
Unrealized Gains debt securities available for sale financial assets 17 45
Unrealized losses debt securities available for sale financial assets (126) (142)
Subtotal Debt securities, available-for-sale 6,857 9,658
Mexico [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 5,671 8,101
Unrealized Gains debt securities available for sale financial assets 11 34
Unrealized losses debt securities available for sale financial assets (111) (120)
Subtotal Debt securities, available-for-sale 5,572 8,015
Mexico [Member] | Other [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,294 1,654
Unrealized Gains debt securities available for sale financial assets 6 11
Unrealized losses debt securities available for sale financial assets (15) (22)
Subtotal Debt securities, available-for-sale 1,286 1,643
Mexico [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 0 0
Unrealized Gains debt securities available for sale financial assets 0 0
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 0 0
Mexico [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 30 212
Unrealized Gains debt securities available for sale financial assets 0 1
Unrealized losses debt securities available for sale financial assets (1) (3)
Subtotal Debt securities, available-for-sale 30 209
Mexico [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,265 1,442
Unrealized Gains debt securities available for sale financial assets 6 10
Unrealized losses debt securities available for sale financial assets (14) (19)
Subtotal Debt securities, available-for-sale 1,256 1,434
The United States [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 14,044 12,479
Unrealized Gains debt securities available for sale financial assets 27 36
Unrealized losses debt securities available for sale financial assets (271) (198)
Subtotal Debt securities, available-for-sale 13,799 12,317
The United States [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 10,296 8,625
Unrealized Gains debt securities available for sale financial assets 13 8
Unrealized losses debt securities available for sale financial assets (191) (133)
Subtotal Debt securities, available-for-sale 10,118 8,500
The United States [Member] | Total State Debt [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 5,944 3,052
Unrealized Gains debt securities available for sale financial assets 6 0
Unrealized losses debt securities available for sale financial assets (89) (34)
Subtotal Debt securities, available-for-sale 5,861 3,018
The United States [Member] | States And Political Subdivisions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 4,351 5,573
Unrealized Gains debt securities available for sale financial assets 7 8
Unrealized losses debt securities available for sale financial assets (102) (99)
Subtotal Debt securities, available-for-sale 4,256 5,482
The United States [Member] | Other [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 3,748 3,854
Unrealized Gains debt securities available for sale financial assets 14 28
Unrealized losses debt securities available for sale financial assets (80) (65)
Subtotal Debt securities, available-for-sale 3,681 3,817
The United States [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 0 0
Unrealized Gains debt securities available for sale financial assets 0 0
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 0 0
The United States [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 50 56
Unrealized Gains debt securities available for sale financial assets 1 1
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 51 57
The United States [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 3,698 3,798
Unrealized Gains debt securities available for sale financial assets 13 26
Unrealized losses debt securities available for sale financial assets (80) (65)
Subtotal Debt securities, available-for-sale 3,630 3,759
Turkey [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 4,582 5,052
Unrealized Gains debt securities available for sale financial assets 33 48
Unrealized losses debt securities available for sale financial assets (206) (115)
Subtotal Debt securities, available-for-sale 4,409 4,985
Turkey [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 4,211 5,033
Unrealized Gains debt securities available for sale financial assets 32 48
Unrealized losses debt securities available for sale financial assets (191) (114)
Subtotal Debt securities, available-for-sale 4,052 4,967
Turkey [Member] | Other [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 371 19
Unrealized Gains debt securities available for sale financial assets 1 1
Unrealized losses debt securities available for sale financial assets (15) (1)
Subtotal Debt securities, available-for-sale 357 19
Turkey [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 0 0
Unrealized Gains debt securities available for sale financial assets 0 0
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 0 0
Turkey [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 349 19
Unrealized Gains debt securities available for sale financial assets 0 0
Unrealized losses debt securities available for sale financial assets (15) (1)
Subtotal Debt securities, available-for-sale 334 19
Turkey [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 22 0
Unrealized Gains debt securities available for sale financial assets 1 0
Unrealized losses debt securities available for sale financial assets 0 0
Subtotal Debt securities, available-for-sale 23 0
Other countries [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 12,208 13,271
Unrealized Gains debt securities available for sale financial assets 331 533
Unrealized losses debt securities available for sale financial assets (126) (117)
Subtotal Debt securities, available-for-sale 12,413 13,687
Other countries [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 6,479 6,774
Unrealized Gains debt securities available for sale financial assets 165 325
Unrealized losses debt securities available for sale financial assets (82) (77)
Subtotal Debt securities, available-for-sale 6,562 7,022
Other countries [Member] | Other [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 5,729 6,497
Unrealized Gains debt securities available for sale financial assets 166 208
Unrealized losses debt securities available for sale financial assets (43) (40)
Subtotal Debt securities, available-for-sale 5,852 6,664
Other countries [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 947 1,330
Unrealized Gains debt securities available for sale financial assets 2 2
Unrealized losses debt securities available for sale financial assets (2) (1)
Subtotal Debt securities, available-for-sale 946 1,331
Other countries [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,992 2,535
Unrealized Gains debt securities available for sale financial assets 120 139
Unrealized losses debt securities available for sale financial assets (23) (19)
Subtotal Debt securities, available-for-sale 2,089 2,654
Other countries [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 2,790 2,632
Unrealized Gains debt securities available for sale financial assets 44 66
Unrealized losses debt securities available for sale financial assets (18) (19)
Subtotal Debt securities, available-for-sale 2,816 2,679
Total Domestic Foreign [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 59,951 [1] 65,273 [2]
Unrealized Gains debt securities available for sale financial assets 1,382 1,567
Unrealized losses debt securities available for sale financial assets (732) (589)
Subtotal Debt securities, available-for-sale € 60,600 € 66,251
[1]

(*) The amortized cost includes portfolio gains/losses linked to insurance contracts in which the policyholder assumes the risk in case of redemption.

[2]

(*) The amortized cost includes portfolio gains/losses linked to insurance contracts in which the policyholder assumes the risk in case of redemption.