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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, 2018
Dec. 31, 2017
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions € 33,307 € 54,516
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 2,303 762
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 2,941 526
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 598 282
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 372 448
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 2,881 1,563
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 463 73
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 187 77
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 9,745 3,731
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 2,555 3,879
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 7,438 12,592
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 610 330
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 2,173 2,538
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 2,063 2,398
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 845 836
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 2,931 3,369
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 18,616 25,941
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 1 878
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 4,254 21,732
Repurchase Agreements [Member] | Mexico [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 582 1,817
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 104 13
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] | Turkey [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 4 44
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
Repurchase Agreements [Member] | Total [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 4,946 24,843
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 4,860 5,518
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 14,633 34,849
Total [Member] | Mexico [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 1,791 2,429
Total [Member] | South America [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 2,649 2,999
Total [Member] | United States [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 4,944 3,961
Total [Member] | Turkey [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions 1,313 953
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 3,119 3,806
Total [Member] | Total [Member]    
Deposits from credit institutions. Breakdown by geographical area and nature of the instrument Line Items    
Deposits from credit institutions € 33,307 € 54,516