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Note 26 - Common Stock - Classes Of Share Capital (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Classes Of Share Capital Line Items |  |  |
Capital (Capital base and capital management) | € 3,267,000,000 | € 3,267,000,000 | € 3,267,000,000
Par Value Per Share | € 0.49 | € 0.49 | € 0.49

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