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Note 13 - Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
National Company Shares [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets € 2,182,000,000 € 2,181,000,000 € 2,172,000,000
Unrealized Gains equity instruments available for sale financial assets 0 0 0
Unrealized losses equity instruments available for sale financial assets (1,309,000,000) (507,000,000) (210,000,000)
Equity instruments, available-for-sale 873,000,000 1,674,000,000 1,962,000,000
Foreign Company Shares [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 100,000,000 136,000,000 90,000,000
Unrealized Gains equity instruments available for sale financial assets 38,000,000 87,000,000 43,000,000
Unrealized losses equity instruments available for sale financial assets (17,000,000) (11,000,000) (12,000,000)
Equity instruments, available-for-sale 121,000,000 213,000,000 121,000,000
Foreign Company Shares [Member] | United States [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 27,000,000 30,000,000 20,000,000
Unrealized Gains equity instruments available for sale financial assets 0 47,000,000 17,000,000
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 27,000,000 78,000,000 37,000,000
Foreign Company Shares [Member] | Mexico [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 1,000,000 1,000,000 1,000,000
Unrealized Gains equity instruments available for sale financial assets 33,000,000 33,000,000 25,000,000
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 34,000,000 34,000,000 26,000,000
Foreign Company Shares [Member] | Turkey [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,000,000 3,000,000 3,000,000
Unrealized Gains equity instruments available for sale financial assets 4,000,000 2,000,000 0
Unrealized losses equity instruments available for sale financial assets 0 0 (1,000,000)
Equity instruments, available-for-sale 6,000,000 5,000,000 2,000,000
Foreign Company Shares [Member] | Other countries [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 70,000,000 102,000,000 66,000,000
Unrealized Gains equity instruments available for sale financial assets 1,000,000 5,000,000 1,000,000
Unrealized losses equity instruments available for sale financial assets (17,000,000) (11,000,000) (11,000,000)
Equity instruments, available-for-sale 54,000,000 96,000,000 56,000,000
Subtotal Listed Equity [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,282,000,000 2,317,000,000 2,262,000,000
Unrealized Gains equity instruments available for sale financial assets 38,000,000 87,000,000 43,000,000
Unrealized losses equity instruments available for sale financial assets (1,326,000,000) (518,000,000) (222,000,000)
Equity instruments, available-for-sale 995,000,000 1,886,000,000 2,083,000,000
National Company Shares Unlisted [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 5,000,000 5,000,000 6,000,000
Unrealized Gains equity instruments available for sale financial assets 1,000,000 1,000,000 1,000,000
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 5,000,000 5,000,000 7,000,000
Foreign Company Shares Unlisted [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 58,000,000 450,000,000 453,000,000
Unrealized Gains equity instruments available for sale financial assets 43,000,000 79,000,000 54,000,000
Unrealized losses equity instruments available for sale financial assets (1,000,000) (1,000,000) (1,000,000)
Equity instruments, available-for-sale 100,000,000 528,000,000 506,000,000
Foreign Company Shares Unlisted [Member] | United States [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 0 387,000,000 388,000,000
Unrealized Gains equity instruments available for sale financial assets 0 32,000,000 23,000,000
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 0 419,000,000 411,000,000
Foreign Company Shares Unlisted [Member] | Mexico [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
Foreign Company Shares Unlisted [Member] | Turkey [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 5,000,000 5,000,000 6,000,000
Unrealized Gains equity instruments available for sale financial assets 0 4,000,000 4,000,000
Unrealized losses equity instruments available for sale financial assets 0 0 0
Equity instruments, available-for-sale 5,000,000 9,000,000 10,000,000
Foreign Company Shares Unlisted [Member] | Other countries [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 52,000,000 57,000,000 59,000,000
Unrealized Gains equity instruments available for sale financial assets 43,000,000 43,000,000 27,000,000
Unrealized losses equity instruments available for sale financial assets (1,000,000) (1,000,000) (1,000,000)
Equity instruments, available-for-sale 94,000,000 99,000,000 85,000,000
Subtotal Unlisted Equity [Member]      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 62,000,000 454,000,000 459,000,000
Unrealized Gains equity instruments available for sale financial assets 44,000,000 80,000,000 55,000,000
Unrealized losses equity instruments available for sale financial assets (1,000,000) (1,000,000) (1,000,000)
Equity instruments, available-for-sale 105,000,000 533,000,000 513,000,000
Total Member      
Available for sale financial assets equity instruments [Line Items]      
Amortized cost equity instruments available for sale financial assets 2,344,000,000 2,772,000,000 2,721,000,000
Unrealized Gains equity instruments available for sale financial assets 82,000,000 167,000,000 98,000,000
Unrealized losses equity instruments available for sale financial assets (1,327,000,000) (519,000,000) (223,000,000)
Equity instruments, available-for-sale € 1,100,000,000 € 2,420,000,000 € 2,595,000,000