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Note 19 - Tax assets and liabilities- Tax Recognized in Total Equity (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities and Other [Member]      
Disclosure of tax assets and liabilties Line Items      
Tax Recognized - Total Equity € (87) € (355) € (533)
Equity instruments [Member]      
Disclosure of tax assets and liabilties Line Items      
Tax Recognized - Total Equity (56) (74) (2)
Subtotal [Member]      
Disclosure of tax assets and liabilties Line Items      
Tax Recognized - Total Equity (143) (429) (535)
Total [Member]      
Disclosure of tax assets and liabilties Line Items      
Tax Recognized - Total Equity € (143) € (429) € (535)