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Financial Risk Management and Financial Instruments - Summary of Major Security Type, Financial Assets and Liabilities that are Measured at Fair Value on Recurring Basis and Category Using Fair Value Hierarchy (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial assets at fair value    
Total financial assets at fair value by level € 3,570 € 2,782
Financial liabilities at fair value    
Total financial liabilities at fair value by level 135 138
Contingent consideration    
Financial liabilities at fair value    
Total financial liabilities at fair value by level 30 27
Derivatives (Not Designated for Hedging) | Warrants    
Financial liabilities at fair value    
Total financial liabilities at fair value by level 89 98
Foreign Exchange Forwards | Derivatives (Designated for Hedging)    
Financial assets at fair value    
Total financial assets at fair value by level 12 8
Financial liabilities at fair value    
Total financial liabilities at fair value by level 16 13
Cash Equivalents | Money Market Funds    
Financial assets at fair value    
Total financial assets at fair value by level 685 585
Short Term Investments | Money Market Funds    
Financial assets at fair value    
Total financial assets at fair value by level 25  
Short Term Investments | Government Securities    
Financial assets at fair value    
Total financial assets at fair value by level 229 268
Short Term Investments | Agency Securities    
Financial assets at fair value    
Total financial assets at fair value by level 4 5
Short Term Investments | Corporate Notes    
Financial assets at fair value    
Total financial assets at fair value by level 276 263
Short Term Investments | Collateralized Reverse Purchase Agreements    
Financial assets at fair value    
Total financial assets at fair value by level 62 156
Long Term Investment    
Financial assets at fair value    
Total financial assets at fair value by level 2,277 1,497
Level 1    
Financial assets at fair value    
Total financial assets at fair value by level 3,136 2,295
Level 1 | Cash Equivalents | Money Market Funds    
Financial assets at fair value    
Total financial assets at fair value by level 685 585
Level 1 | Short Term Investments | Money Market Funds    
Financial assets at fair value    
Total financial assets at fair value by level 25  
Level 1 | Short Term Investments | Government Securities    
Financial assets at fair value    
Total financial assets at fair value by level 198 229
Level 1 | Long Term Investment    
Financial assets at fair value    
Total financial assets at fair value by level 2,228 1,481
Level 2    
Financial assets at fair value    
Total financial assets at fair value by level 385 471
Financial liabilities at fair value    
Total financial liabilities at fair value by level 16 13
Level 2 | Foreign Exchange Forwards | Derivatives (Designated for Hedging)    
Financial assets at fair value    
Total financial assets at fair value by level 12 8
Financial liabilities at fair value    
Total financial liabilities at fair value by level 16 13
Level 2 | Short Term Investments | Government Securities    
Financial assets at fair value    
Total financial assets at fair value by level 31 39
Level 2 | Short Term Investments | Agency Securities    
Financial assets at fair value    
Total financial assets at fair value by level 4 5
Level 2 | Short Term Investments | Corporate Notes    
Financial assets at fair value    
Total financial assets at fair value by level 276 263
Level 2 | Short Term Investments | Collateralized Reverse Purchase Agreements    
Financial assets at fair value    
Total financial assets at fair value by level 62 156
Level 3    
Financial assets at fair value    
Total financial assets at fair value by level 49 16
Financial liabilities at fair value    
Total financial liabilities at fair value by level 119 125
Level 3 | Contingent consideration    
Financial liabilities at fair value    
Total financial liabilities at fair value by level 30 27
Level 3 | Derivatives (Not Designated for Hedging) | Warrants    
Financial liabilities at fair value    
Total financial liabilities at fair value by level 89 98
Level 3 | Long Term Investment    
Financial assets at fair value    
Total financial assets at fair value by level € 49 € 16