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Note 25 - Common Stock - Classes Of Share Capital (Details) - EUR (€) | Jun. 30, 2020 | Dec. 31, 2019
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Classes Of Share Capital Line Items |  |
Capital (Capital base and capital management) | € 3,267,000,000 | € 3,267,000,000

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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant