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Inventories - Allowance (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Movements in allowances      
As of January 1 € 2,646    
As of December 31 3,168 € 2,646  
Accumulated impairment      
Movements in allowances      
As of January 1 432 456 € 195
Charged to income statement 153 100 354
Deductions (64) (124) (93)
As of December 31 € 521 € 432 € 456