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Note 26 - Common Stock - Classes Of Share Capital (Details) - EUR (€)	12 Months Ended
	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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The nominal value of capital issued.

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