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Note 22 - Financial liabilities at amortized cost - Deposits from credit institutions by geographical area and instrument (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions € 54,516 € 63,501 € 68,543
Demand Deposits And Other [Member] | Issued in Euros [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 762 956 951
Demand Deposits And Other [Member] | Rest Of Europe [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 526 896 801
Demand Deposits And Other [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 282 306 54
Demand Deposits And Other [Member] | South America [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 448 275 212
Demand Deposits And Other [Member] | United States [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 1,563 1,812 1,892
Demand Deposits And Other [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 73 317 355
Demand Deposits And Other [Member] | Rest of the world [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 77 88 53
Demand Deposits And Other [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 3,731 4,651 4,318
Deposits With Agreed Maturity [Member] | Issued in Euros [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 3,879 4,995 6,718
Deposits With Agreed Maturity [Member] | Rest Of Europe [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 12,592 13,751 15,955
Deposits With Agreed Maturity [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 330 426 673
Deposits With Agreed Maturity [Member] | South America [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 2,538 3,294 3,779
Deposits With Agreed Maturity [Member] | United States [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 2,398 3,225 5,497
Deposits With Agreed Maturity [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 836 1,140 1,423
Deposits With Agreed Maturity [Member] | Rest of the world [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 3,369 3,597 4,108
Deposits With Agreed Maturity [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 25,941 30,429 38,153
Repurchase Agreements [Member] | Issued in Euros [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 878 817 593
Repurchase Agreements [Member] | Rest Of Europe [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 21,732 23,691 23,140
Repurchase Agreements [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 1,817 2,931 916
Repurchase Agreements [Member] | South America [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 13 465 432
Repurchase Agreements [Member] | United States [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 0 3 2
Repurchase Agreements [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 44 5 8
Repurchase Agreements [Member] | Rest of the world [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 360 509 981
Repurchase Agreements [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 24,843 28,420 26,072
Total [Member] | Issued in Euros [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 5,518 6,768 8,262
Total [Member] | Rest Of Europe [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 34,849 38,338 39,896
Total [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 2,429 3,663 1,643
Total [Member] | South America [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 2,999 4,035 4,423
Total [Member] | United States [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 3,961 5,040 7,391
Total [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 953 1,463 1,786
Total [Member] | Rest of the world [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 3,806 4,194 5,142
Total [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions € 54,516 € 63,501 € 68,543