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Note 12 Financial assets at fair value through other comprehensive income equity instruments (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Amortised cost [Member]    
Non listed equity instruments [Line Items]    
Total Equity instruments at fair value through other comprehensive income € 2,396,000,000 € 2,344,000,000
Amortised cost [Member] | UNITED STATES    
Listed equity instruments [Line Items]    
Listed equity instruments 30,000,000 27,000,000
Amortised cost [Member] | MEXICO    
Listed equity instruments [Line Items]    
Listed equity instruments 1,000,000 1,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 0 0
Amortised cost [Member] | TURKEY    
Listed equity instruments [Line Items]    
Listed equity instruments 2,000,000 2,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 5,000,000 5,000,000
Amortised cost [Member] | Other Countries [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 69,000,000 70,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 50,000,000 52,000,000
Amortised cost [Member] | National company shares [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 2,235,000,000 2,182,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 5,000,000 5,000,000
Amortised cost [Member] | Foreign company shares [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 101,000,000 100,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 55,000,000 58,000,000
Amortised cost [Member] | Subtotal listed equity instruments [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 2,336,000,000 2,282,000,000
Amortised cost [Member] | Subtotal unlisted equity instruments [Member]    
Non listed equity instruments [Line Items]    
Unlisted equity instruments 60,000,000 62,000,000
At fair value [member]    
Non listed equity instruments [Line Items]    
Total Equity instruments at fair value through other comprehensive income 1,347,000,000 1,100,000,000
At fair value [member] | UNITED STATES    
Listed equity instruments [Line Items]    
Listed equity instruments 30,000,000 27,000,000
At fair value [member] | MEXICO    
Listed equity instruments [Line Items]    
Listed equity instruments 32,000,000 34,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 1,000,000 1,000,000
At fair value [member] | TURKEY    
Listed equity instruments [Line Items]    
Listed equity instruments 5,000,000 6,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 5,000,000 5,000,000
At fair value [member] | Other Countries [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 58,000,000 54,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 98,000,000 94,000,000
At fair value [member] | National company shares [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 1,114,000,000 873,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 5,000,000 5,000,000
At fair value [member] | Foreign company shares [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 126,000,000 121,000,000
Non listed equity instruments [Line Items]    
Unlisted equity instruments 103,000,000 100,000,000
At fair value [member] | Subtotal listed equity instruments [Member]    
Listed equity instruments [Line Items]    
Listed equity instruments 1,239,000,000 995,000,000
At fair value [member] | Subtotal unlisted equity instruments [Member]    
Non listed equity instruments [Line Items]    
Unlisted equity instruments € 108,000,000 € 105,000,000