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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents [abstract]    
Cash at bank and in hand € 1,005 € 814
Investments (short-term deposits) 2,750 1,532
Total € 3,755 € 2,346