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Leases - Summary of Roll-forward of Lease Right-of-use Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance € 444  
Ending balance 437 € 444
Adoption of IFRS 16    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 444  
Ending balance   444
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 581 587
Increases 23 29
Acquired in business combinations   3
Decreases (2) (3)
Exchange differences 30 (35)
Ending balance 632 581
Accumulated Depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (137) (98)
Depreciation charge (53) (49)
Decreases 2 3
Exchange differences (7) 7
Ending balance € (195) € (137)