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Note 17 - Tangible assets- Subsidiaries (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tangible Assets By Geography Line Items      
Tangible Assets € 7,229 € 7,191 € 8,941
Issued in Euros [Member]      
Tangible Assets By Geography Line Items      
Tangible Assets 2,705 2,574 3,692
Total foreign [Member]      
Tangible Assets By Geography Line Items      
Tangible Assets 4,524 4,617 5,249
Total [Member]      
Tangible Assets By Geography Line Items      
Tangible Assets € 7,229 € 7,191 € 8,941