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Note 13 - Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Issued in Euros [Member] | Total State Debt [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets € 17,205 € 22,765 € 22,427
Unrealized Gains debt securities available for sale financial assets 661 791 711
Unrealized losses debt securities available for sale financial assets (9) (17) (18)
Subtotal Debt securities, available-for-sale 17,857 23,539 23,119
Issued in Euros [Member] | Other [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 1,597 1,951 2,305
Unrealized Gains debt securities available for sale financial assets 100 114 117
Unrealized losses debt securities available for sale financial assets (1) 0 (1)
Subtotal Debt securities, available-for-sale 1,696 2,066 2,421
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 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 0 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 793 891 986
Unrealized Gains debt securities available for sale financial assets 63 72 82
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 855 962 1,067
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 804 1,061 1,319
Unrealized Gains debt securities available for sale financial assets 37 43 36
Unrealized losses debt securities available for sale financial assets (1) 0 (1)
Subtotal Debt securities, available-for-sale 841 1,103 1,354
Total domestic [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 18,802 24,716 24,731
Unrealized Gains debt securities available for sale financial assets 761 906 828
Unrealized losses debt securities available for sale financial assets (10) (17) (19)
Subtotal Debt securities, available-for-sale 19,553 25,605 25,540
Total foreign [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 34,521 40,557 49,253
Unrealized Gains debt securities available for sale financial assets 392 661 773
Unrealized losses debt securities available for sale financial assets (758) (572) (987)
Subtotal Debt securities, available-for-sale 34,157 40,647 49,040
Mexico [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 6,299 9,755 11,525
Unrealized Gains debt securities available for sale financial assets 6 45 19
Unrealized losses debt securities available for sale financial assets (142) (142) (343)
Subtotal Debt securities, available-for-sale 6,163 9,658 11,200
Mexico [Member] | Total State Debt [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 5,286 8,101 9,728
Unrealized Gains debt securities available for sale financial assets 4 34 11
Unrealized losses debt securities available for sale financial assets (121) (120) (301)
Subtotal Debt securities, available-for-sale 5,169 8,015 9,438
Mexico [Member] | Other [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 1,013 1,654 1,797
Unrealized Gains debt securities available for sale financial assets 2 11 8
Unrealized losses debt securities available for sale financial assets (21) (22) (42)
Subtotal Debt securities, available-for-sale 994 1,643 1,763
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 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 0 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 35 212 86
Unrealized Gains debt securities available for sale financial assets 0 1 2
Unrealized losses debt securities available for sale financial assets (1) (3) (1)
Subtotal Debt securities, available-for-sale 34 209 87
Mexico [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 978 1,442 1,710
Unrealized Gains debt securities available for sale financial assets 2 10 6
Unrealized losses debt securities available for sale financial assets (20) (19) (41)
Subtotal Debt securities, available-for-sale 961 1,434 1,675
United States [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 14,507 12,479 14,256
Unrealized Gains debt securities available for sale financial assets 47 36 48
Unrealized losses debt securities available for sale financial assets (217) (198) (261)
Subtotal Debt securities, available-for-sale 14,338 12,317 14,043
United States [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 11,227 8,625 8,460
Unrealized Gains debt securities available for sale financial assets 37 8 9
Unrealized losses debt securities available for sale financial assets (135) (133) (131)
Subtotal Debt securities, available-for-sale 11,130 8,500 8,337
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 7,285 3,052 1,702
Unrealized Gains debt securities available for sale financial assets 29 0 1
Unrealized losses debt securities available for sale financial assets (56) (34) (19)
Subtotal Debt securities, available-for-sale 7,258 3,018 1,683
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 3,942 5,573 6,758
Unrealized Gains debt securities available for sale financial assets 8 8 8
Unrealized losses debt securities available for sale financial assets (79) (99) (112)
Subtotal Debt securities, available-for-sale 3,872 5,482 6,654
United States [Member] | Other [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 3,280 3,854 5,797
Unrealized Gains debt securities available for sale financial assets 10 28 39
Unrealized losses debt securities available for sale financial assets (82) (65) (130)
Subtotal Debt securities, available-for-sale 3,208 3,817 5,706
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 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 0 0 0
United States [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 49 56 95
Unrealized Gains debt securities available for sale financial assets 1 1 2
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 50 57 97
United States [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 3,231 3,798 5,702
Unrealized Gains debt securities available for sale financial assets 9 26 37
Unrealized losses debt securities available for sale financial assets (82) (65) (130)
Subtotal Debt securities, available-for-sale 3,158 3,759 5,609
Turkey [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 4,164 5,052 5,550
Unrealized Gains debt securities available for sale financial assets 20 48 73
Unrealized losses debt securities available for sale financial assets (269) (115) (180)
Subtotal Debt securities, available-for-sale 3,916 4,985 5,443
Turkey [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 4,007 5,033 5,055
Unrealized Gains debt securities available for sale financial assets 20 48 70
Unrealized losses debt securities available for sale financial assets (256) (114) (164)
Subtotal Debt securities, available-for-sale 3,771 4,967 4,961
Turkey [Member] | Other [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 157 19 495
Unrealized Gains debt securities available for sale financial assets 0 1 2
Unrealized losses debt securities available for sale financial assets (13) (1) (16)
Subtotal Debt securities, available-for-sale 145 19 482
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 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
Subtotal Debt securities, available-for-sale 0 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 157 19 448
Unrealized Gains debt securities available for sale financial assets 0 0 2
Unrealized losses debt securities available for sale financial assets (13) (1) (15)
Subtotal Debt securities, available-for-sale 145 19 436
Turkey [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 47
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 (1)
Subtotal Debt securities, available-for-sale 0 0 46
Other countries [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 9,551 13,271 17,923
Unrealized Gains debt securities available for sale financial assets 319 533 634
Unrealized losses debt securities available for sale financial assets (130) (117) (203)
Subtotal Debt securities, available-for-sale 9,740 13,687 18,354
Other countries [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 4,510 6,774 7,882
Unrealized Gains debt securities available for sale financial assets 173 325 373
Unrealized losses debt securities available for sale financial assets (82) (77) (98)
Subtotal Debt securities, available-for-sale 4,601 7,022 8,156
Other countries [Member] | Other [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 5,041 6,497 10,041
Unrealized Gains debt securities available for sale financial assets 146 208 261
Unrealized losses debt securities available for sale financial assets (48) (40) (105)
Subtotal Debt securities, available-for-sale 5,139 6,664 10,197
Other countries [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 987 1,330 1,657
Unrealized Gains debt securities available for sale financial assets 2 2 4
Unrealized losses debt securities available for sale financial assets (4) (1) (2)
Subtotal Debt securities, available-for-sale 986 1,331 1,659
Other countries [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 1,856 2,535 3,269
Unrealized Gains debt securities available for sale financial assets 111 139 96
Unrealized losses debt securities available for sale financial assets (20) (19) (54)
Subtotal Debt securities, available-for-sale 1,947 2,654 3,311
Other countries [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 2,197 2,632 5,115
Unrealized Gains debt securities available for sale financial assets 33 66 161
Unrealized losses debt securities available for sale financial assets (25) (19) (49)
Subtotal Debt securities, available-for-sale 2,206 2,679 5,227
Total Domestic Foreign [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 53,323 [1] 65,273 [2] 73,985 [3]
Unrealized Gains debt securities available for sale financial assets 1,153 1,567 1,601
Unrealized losses debt securities available for sale financial assets (768) (589) (1,006)
Subtotal Debt securities, available-for-sale € 53,709 € 66,251 € 74,580
[1]

(*) The amortized co st 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.

[3]

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