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Note 17 - Tangible assets- Subsidiaries (Details) - EUR (€)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tangible Assets By Geography Line Items
Tangible Assets From Disposable Groups	€ 7,823,000,000	€ 10,068,000,000	€ 7,229,000,000
Issued in Euros [Member]
Tangible Assets By Geography Line Items
Tangible Assets From Disposable Groups	4,294,000,000	4,865,000,000	2,705,000,000
Total foreign [Member]
Tangible Assets By Geography Line Items
Tangible Assets From Disposable Groups	€ 3,529,000,000	€ 5,203,000,000	€ 4,524,000,000

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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. (c )The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both

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