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Note 22 - Financial liabilities at amortized cost - Deposits from customers by geographical area and instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits € 375,970 € 376,379 € 401,465
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 138,236 123,382 102,730
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 7,233 6,816 6,959
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 38,383 36,492 36,468
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 23,811 23,710 9,862
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 41,222 36,728 26,997
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 10,856 12,427 47,340
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 831 1,028 1,190
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 260,573 240,583 231,547
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 28,165 39,513 56,391
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 14,415 13,372 19,683
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 11,837 11,622 10,647
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 14,159 15,053 28,328
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 21,317 21,436 23,023
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 22,564 24,237 14,971
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 1,731 1,484 3,382
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 114,188 126,716 156,425
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 3 2,664 1,901
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 429 1,989 4,306
Repurchase Agreements By Geographical Area [Member] | Mexico [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 770 4,272 7,002
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 0 2 21
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 0 263
Repurchase Agreements By Geographical Area [Member] | Turkey [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 7 152 0
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 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 1,209 9,079 13,493
Total [Member] | Issued in Euros [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 166,403 165,559 161,022
Total [Member] | Rest Of Europe [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 22,077 22,177 30,949
Total [Member] | Mexico [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 50,991 52,387 54,117
Total [Member] | South America [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 37,970 38,764 38,211
Total [Member] | United States [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 62,539 58,164 50,282
Total [Member] | Turkey [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 33,427 36,815 62,311
Total [Member] | Rest of the world [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits 2,563 2,511 4,572
Total [Member] | Total [Member]      
Deposits from customers. Breakdown by geographical area and nature of the instrument Line Items      
Customer deposits € 375,970 € 376,379 € 401,465