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Financial Risk Factors and Risk Management - Designated Hedging Instruments in Foreign Currency Exchange Rate Hedges (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Carrying amount    
Other financial assets € 2,633 € 1,984
Forecasted License Payments | Foreign Currency    
FINANCIAL RISK FACTORS    
Notional amount 518  
Carrying amount    
Other financial assets 3  
Other financial liabilities (11)  
Change in value recognised in OCI 7  
Hedge ineffectiveness recognised in Finance income, net 0  
Cost of hedging recognized in OCI 2  
Amount reclassified from cash flow hedge in OCI to Other non-operating income, net (22)  
Amount reclassified from cost of hedging in OCI to Finance income, net € (6)