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Inventories (Details 1) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
InventoriesLineItems [Line Items]    
Carrying amount at the beginning of the year € 4,637 € 4,579
Changes 314 (29)
New or increased provisions (81) (125)
Deductions 18 163
Currency translation differences (232) 56
Other changes (35) (7)
Carrying amount at the end of the year 4,621 4,637
Gross carrying amount [member]    
InventoriesLineItems [Line Items]    
Carrying amount at the beginning of the year 4,892 4,887
Changes 314 (29)
Currency translation differences (254) 61
Other changes (86) (27)
Carrying amount at the end of the year 4,866 4,892
Loss provision[member]    
InventoriesLineItems [Line Items]    
Carrying amount at the beginning of the year (255) (308)
New or increased provisions (81) (125)
Deductions 18 163
Currency translation differences 22 (5)
Other changes 51 20
Carrying amount at the end of the year € (245) € (255)