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Note 20 - Other assets and liabilities- Inventories from distressed customers (Details) - Inventories [Member] - Gross carrying amount [Member] - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories Distressed Customers Line Items      
Inventories from distressed customers at the beginning € 91 € 8,499 € 9,318
Carrying amount inventories from distressed customers 49 65 3,114
Change In Inventories Abstract      
BusinessCombinationsAndDisposals 0 0 0
Acquisitions Inventories 0 533 336
Disposals Inventories (20) (2,288) (1,214)
Others Distressed Customers 0 (6,653) 59
Inventories from distressed customers at the end 71 91 8,499
Impairment losses € (21) € (26) € (5,385)