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Basis for Preparation - Standards Not Yet Adopted (Details) - EUR (€)
€ in Millions
12 Months Ended
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
IFRS 16        
Operating profit   € 5,703 € 4,877 € 5,135
Cash flows from operating activities   4,303 € 5,045 € 4,628
Application of IFRS 16        
IFRS 16        
Total assets € 1,900      
Total liabilities 2,000      
Cash flows from operating activities 400 € 300    
Application of IFRS 16 | Highest        
IFRS 16        
Operating profit 100      
Retained Earnings | Application of IFRS 16        
IFRS 16        
Amount recorded as an adjustment to retained earnings as of the date of initial application € 100