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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions € 31,978 € 54,516 € 63,501
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 1,981 762 956
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 3,108 526 896
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 280 282 306
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 442 448 275
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 1,701 1,563 1,812
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 651 73 317
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 207 77 88
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 8,370 3,731 4,651
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 2,527 3,879 4,995
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 6,903 12,592 13,751
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 286 330 426
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 1,892 2,538 3,294
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 2,677 2,398 3,225
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 669 836 1,140
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 4,061 3,369 3,597
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 19,015 25,941 30,429
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 55 878 817
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 4,534 21,732 23,691
Repurchase Agreements [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 0 1,817 2,931
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 0 13 465
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 0 3
Repurchase Agreements [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 4 44 5
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 0 360 509
Repurchase Agreements [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 4,593 24,843 28,420
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 4,563 5,518 6,768
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 14,545 34,849 38,338
Total [Member] | Mexico [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 566 2,429 3,663
Total [Member] | South America [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 2,335 2,999 4,035
Total [Member] | United States [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 4,379 3,961 5,040
Total [Member] | Turkey [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions 1,323 953 1,463
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 4,268 3,806 4,194
Total [Member] | Total [Member]      
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items      
Deposits from credit institutions € 31,978 € 54,516 € 63,501