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Note 21 - Financial liabilities at amortized cost - Deposits from credit institutions by geographical area and instrument (Details) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions € 32,899 € 31,978
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 2,502 1,981
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 2,496 1,701
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 371 280
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 337 651
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 435 442
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 3,519 3,108
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 199 207
Demand Deposits And Other [Member] | Total    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 9,859 8,370
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 2,109 2,527
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 3,952 2,677
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 675 286
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 553 669
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 1,789 1,892
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 6,289 6,903
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 4,308 4,061
Deposits With Agreed Maturity [Member] | Total    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 19,674 19,015
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 336 55
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
Repurchase Agreements [Member] | Mexico [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 413 0
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 4
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 0
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 2,613 4,534
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 0
Repurchase Agreements [Member] | Total    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 3,366 4,593
Total | Issued in Euros [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 4,947 4,563
Total | United States [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 6,448 4,379
Total | Mexico [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 1,459 566
Total | Turkey [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 894 1,323
Total | South America [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 2,224 2,335
Total | Rest Of Europe [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 12,420 14,545
Total | Rest of the world [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 4,508 4,268
Total | Total    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions € 32,899 € 31,978