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Leases - Summary of Roll-forward of Lease Liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about leases for lessee [abstract]      
Beginning balance € 628 € 541  
Increases 32 147  
Acquired in business combinations 3 11  
Payments (79) (54)  
Interest expense 41 38 € 0
Decreases 0 (28)  
Lease incentives received 20 15 0
Increases in lease incentives receivable (1) (47)  
Exchange differences (36) 5  
Ending balance € 608 € 628 € 541