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Note 19 - Tax assets and liabilities- Tax Recognized in Total Equity (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities and Other [Member] |  |  |
Disclosure of tax assets and liabilties Line Items |  |  |
Tax Recognized - Total Equity | € (230,000,000) | € (130,000,000) | € (87,000,000)
Equity instruments [Member] |  |  |
Disclosure of tax assets and liabilties Line Items |  |  |
Tax Recognized - Total Equity | (43,000,000) | (40,000,000) | (56,000,000)
Subtotal [Member] |  |  |
Disclosure of tax assets and liabilties Line Items |  |  |
Tax Recognized - Total Equity | (273,000,000) | (170,000,000) | (143,000,000)
Total Member |  |  |
Disclosure of tax assets and liabilties Line Items |  |  |
Tax Recognized - Total Equity | € (273,000,000) | € (170,000,000) | € (143,000,000)

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