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Leases - Summary of Roll-forward of Lease Right-of-use Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance € 489  
Ending balance 444 € 489
Adoption of IFRS 16    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 489  
Ending balance   489
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 587 471
Increases 29 138
Acquired in business combinations 3 11
Decreases (3) (39)
Exchange differences (35) 6
Ending balance 581 587
Accumulated Depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (98) (75)
Depreciation charge (49) (42)
Decreases 3 21
Exchange differences 7 (2)
Ending balance € (137) € (98)