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Note 12 - Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Equity Instruments Listed [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets € 2,292 € 2,404
Unrealized Gains equity instruments available for sale financial assets 66 33
Unrealized losses equity instruments available for sale financial assets (236) (8)
Equity instruments, available-for-sale 2,123 2,429
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
Unrealized Gains equity instruments available for sale financial assets 0 0
Unrealized losses equity instruments available for sale financial assets (226) (1)
Equity instruments, available-for-sale 1,947 2,188
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
Unrealized Gains equity instruments available for sale financial assets 0 0
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 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
Unrealized Gains equity instruments available for sale financial assets 0 0
Unrealized losses equity instruments available for sale financial assets (226) (1)
Equity instruments, available-for-sale 1,947 2,188
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 120 215
Unrealized Gains equity instruments available for sale financial assets 66 33
Unrealized losses equity instruments available for sale financial assets (10) (7)
Equity instruments, available-for-sale 176 241
Equity Instruments Listed [Member] | USA [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets 48 11
Unrealized Gains equity instruments available for sale financial assets 40 0
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 88 11
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
Unrealized Gains equity instruments available for sale financial assets 24 25
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 25 33
Equity Instruments Listed [Member] | Turkey [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets 4 4
Unrealized Gains equity instruments available for sale financial assets 0 1
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 4 5
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 67 192
Unrealized Gains equity instruments available for sale financial assets 1 7
Unrealized losses equity instruments available for sale financial assets (10) (7)
Equity instruments, available-for-sale 59 192
Unlisted Equity Instruments [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets 426 698
Unrealized Gains equity instruments available for sale financial assets 31 106
Unrealized losses equity instruments available for sale financial assets (1) (8)
Equity instruments, available-for-sale 457 796
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
Unrealized Gains equity instruments available for sale financial assets 1 29
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 6 62
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
Unrealized Gains equity instruments available for sale financial assets 0 0
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 0 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
Unrealized Gains equity instruments available for sale financial assets 1 29
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 6 58
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 421 665
Unrealized Gains equity instruments available for sale financial assets 31 77
Unrealized losses equity instruments available for sale financial assets (1) (8)
Equity instruments, available-for-sale 450 734
Unlisted Equity Instruments [Member] | USA [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets 355 498
Unrealized Gains equity instruments available for sale financial assets 0 40
Unrealized losses equity instruments available for sale financial assets 0 (6)
Equity instruments, available-for-sale 355 532
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
Unrealized Gains equity instruments available for sale financial assets 0 0
Unrealized losses equity instruments available for sale financial assets 0 0
Equity instruments, available-for-sale 0 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 7 15
Unrealized Gains equity instruments available for sale financial assets 5 6
Unrealized losses equity instruments available for sale financial assets 0 (2)
Equity instruments, available-for-sale 12 19
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
Unrealized Gains equity instruments available for sale financial assets 25 31
Unrealized losses equity instruments available for sale financial assets (1) 0
Equity instruments, available-for-sale 84 182
Total [Member]    
Available for sale financial assets equity instruments [Line Items]    
Amortized cost equity instruments available for sale financial assets 2,718 3,102
Unrealized Gains equity instruments available for sale financial assets 97 139
Unrealized losses equity instruments available for sale financial assets (236) (16)
Equity instruments, available-for-sale € 2,579 € 3,224