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Financial Risk Management - Foreign Currency Exchange Rate Risk Management (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
FINANCIAL RISK FACTORS      
Maximum derivative financial instruments hedge horizon and maturity 12 months    
Ineffectiveness reported € 0 € 0 € 0
The timeframe of occurrence of hedged forecasted transactions and recognition in profit or loss 12 months    
Euro and all major currencies      
FINANCIAL RISK FACTORS      
Upward/downward shift 10.00%    
Euro and Brazilian real      
FINANCIAL RISK FACTORS      
Upward/downward shift   25.00% 25.00%
Euro and all other major currencies      
FINANCIAL RISK FACTORS      
Upward/downward shift   10.00% 10.00%
Foreign Currency      
FINANCIAL RISK FACTORS      
Exposure € 900 € 900  
Average | Foreign Currency      
FINANCIAL RISK FACTORS      
Exposure 900 900  
Highest | Foreign Currency      
FINANCIAL RISK FACTORS      
Exposure 1,000 1,000  
Lowest | Foreign Currency      
FINANCIAL RISK FACTORS      
Exposure € 900 € 800