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Note 13 - Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Instruments Listed [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets € 2,262 € 2,404 € 4,483
Unrealized Gains equity instruments available for sale financial assets 43 33 306
Unrealized losses equity instruments available for sale financial assets (222) (8) (960)
Equity instruments, available-for-sale 2,083 2,429 3,829
Equity Instruments Listed [Member] | Issued in Euros [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,172 2,189 3,690
Unrealized Gains equity instruments available for sale financial assets 0 0 17
Unrealized losses equity instruments available for sale financial assets (210) (1) (944)
Equity instruments, available-for-sale 1,962 2,188 2,763
Equity Instruments Listed [Member] | Credit Institutions [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 0 0 0
Unrealized Gains equity instruments available for sale financial assets 0 0 0
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 0 0 0
Equity Instruments Listed [Member] | Other Issuers [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,172 2,189 3,690
Unrealized Gains equity instruments available for sale financial assets 0 0 17
Unrealized losses equity instruments available for sale financial assets (210) (1) (944)
Equity instruments, available-for-sale 1,962 2,188 2,763
Equity Instruments Listed [Member] | Foreign company shares [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 90 215 793
Unrealized Gains equity instruments available for sale financial assets 43 33 289
Unrealized losses equity instruments available for sale financial assets (12) (7) (15)
Equity instruments, available-for-sale 121 241 1,066
Equity Instruments Listed [Member] | USA [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 20 11 16
Unrealized Gains equity instruments available for sale financial assets 17 0 22
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 37 11 38
Equity Instruments Listed [Member] | Mexico [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 1 8 8
Unrealized Gains equity instruments available for sale financial assets 25 25 33
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 26 33 41
Equity Instruments Listed [Member] | Turkey [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 3 4 5
Unrealized Gains equity instruments available for sale financial assets 0 1 1
Unrealized losses equity instruments available for sale financial assets (1) 0 0
Equity instruments, available-for-sale 2 5 6
Equity Instruments Listed [Member] | Other countries [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 66 192 763
Unrealized Gains equity instruments available for sale financial assets 1 7 234
Unrealized losses equity instruments available for sale financial assets (11) (7) (15)
Equity instruments, available-for-sale 56 192 981
Unlisted Equity Instruments [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 459 698 766
Unrealized Gains equity instruments available for sale financial assets 55 106 48
Unrealized losses equity instruments available for sale financial assets (1) (8) (3)
Equity instruments, available-for-sale 513 796 811
Unlisted Equity Instruments [Member] | Issued in Euros [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 6 33 57
Unrealized Gains equity instruments available for sale financial assets 1 29 2
Unrealized losses equity instruments available for sale financial assets 0 0 (1)
Equity instruments, available-for-sale 7 62 59
Unlisted Equity Instruments [Member] | Credit Institutions [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 0 4 4
Unrealized Gains equity instruments available for sale financial assets 0 0 0
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 0 4 4
Unlisted Equity Instruments [Member] | Other Issuers [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 6 29 53
Unrealized Gains equity instruments available for sale financial assets 1 29 2
Unrealized losses equity instruments available for sale financial assets 0 0 (1)
Equity instruments, available-for-sale 7 58 55
Unlisted Equity Instruments [Member] | Foreign company shares [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 453 665 708
Unrealized Gains equity instruments available for sale financial assets 54 77 46
Unrealized losses equity instruments available for sale financial assets (1) (8) (2)
Equity instruments, available-for-sale 506 734 752
Unlisted Equity Instruments [Member] | USA [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 388 498 537
Unrealized Gains equity instruments available for sale financial assets 23 40 13
Unrealized losses equity instruments available for sale financial assets 0 (6) 0
Equity instruments, available-for-sale 411 532 550
Unlisted Equity Instruments [Member] | Mexico [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 0 1 1
Unrealized Gains equity instruments available for sale financial assets 0 0 0
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 0 1 1
Unlisted Equity Instruments [Member] | Turkey [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 6 15 18
Unrealized Gains equity instruments available for sale financial assets 4 6 7
Unrealized losses equity instruments available for sale financial assets 0 (2) (2)
Equity instruments, available-for-sale 10 19 24
Unlisted Equity Instruments [Member] | Other countries [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 59 151 152
Unrealized Gains equity instruments available for sale financial assets 27 31 26
Unrealized losses equity instruments available for sale financial assets (1) 0 0
Equity instruments, available-for-sale 85 182 178
Total [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,721 3,102 5,248
Unrealized Gains equity instruments available for sale financial assets 98 139 355
Unrealized losses equity instruments available for sale financial assets (223) (16) (962)
Equity instruments, available-for-sale € 2,595 € 3,224 € 4,641