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Financial Risk Management and Financial Instruments - Summary of Liquidity Position in Terms of Available Cash and Cash Equivalents and Short Term Investments (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Liquidity Risk [Line Items]    
Short term investments € 596 € 692
Liquidity Position    
Disclosure Of Liquidity Risk [Line Items]    
Short term investments 596 692
Cash equivalents 685 585
Cash at bank and on hand 466 480
Liquidity position € 1,747 € 1,757