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Note 21 - Financial liabilities at amortized cost - Deposits from customers by geographical area and instruments (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits € 367,312 € 376,379
Demand Deposits And Other By Geographical Area [Member] | Issued in Euros [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 130,240 123,382
Demand Deposits And Other By Geographical Area [Member] | Rest Of Europe [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 7,054 6,816
Demand Deposits And Other By Geographical Area [Member] | Mexico [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 37,214 36,492
Demand Deposits And Other By Geographical Area [Member] | South America [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 22,954 23,710
Demand Deposits And Other By Geographical Area [Member] | United States [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 39,436 36,728
Demand Deposits And Other By Geographical Area [Member] | Turkey [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 11,849 12,427
Demand Deposits And Other By Geographical Area [Member] | Rest of the world [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 809 1,028
Demand Deposits And Other By Geographical Area [Member] | Total [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 249,557 240,583
Deposits With Agreed Maturity By Geographical Area [Member] | Issued in Euros [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 32,567 39,513
Deposits With Agreed Maturity By Geographical Area [Member] | Rest Of Europe [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 11,876 13,372
Deposits With Agreed Maturity By Geographical Area [Member] | Mexico [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 11,618 11,622
Deposits With Agreed Maturity By Geographical Area [Member] | South America [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 15,143 15,053
Deposits With Agreed Maturity By Geographical Area [Member] | United States [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 21,292 21,436
Deposits With Agreed Maturity By Geographical Area [Member] | Turkey [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 22,470 24,237
Deposits With Agreed Maturity By Geographical Area [Member] | Rest of the world [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 1,295 1,484
Deposits With Agreed Maturity By Geographical Area [Member] | Total [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 116,262 126,716
Repurchase Agreements By Geographical Area [Member] | Issued in Euros [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 16 2,664
Repurchase Agreements By Geographical Area [Member] | Rest Of Europe [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 110 1,989
Repurchase Agreements By Geographical Area [Member] | Mexico [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 1,356 4,272
Repurchase Agreements By Geographical Area [Member] | South America [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 2 2
Repurchase Agreements By Geographical Area [Member] | United States [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 0 0
Repurchase Agreements By Geographical Area [Member] | Turkey [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 10 152
Repurchase Agreements By Geographical Area [Member] | Rest of the world [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 0 0
Repurchase Agreements By Geographical Area [Member] | Total [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 1,494 9,079
Total [Member] | Issued in Euros [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 162,823 165,559
Total [Member] | Rest Of Europe [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 19,040 22,177
Total [Member] | Mexico [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 50,189 52,387
Total [Member] | South America [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 38,099 38,764
Total [Member] | United States [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 60,728 58,164
Total [Member] | Turkey [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 34,329 36,815
Total [Member] | Rest of the world [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits 2,104 2,511
Total [Member] | Total [Member]    
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items    
Customer deposits € 367,312 € 376,379