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Goodwill and Intangible Assets - Additional Information (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2020
Divisions
GeographicalAreas
Dec. 31, 2019
EUR (€)
Disclosure of detailed information about intangible assets [line items]    
Number of divisions included in cash generating units | Divisions 3  
Number of geographical areas included in cash generating units | GeographicalAreas 3  
Number of cash generating units 10  
Impairment of goodwill | €   € 18
Pre-tax discount rate   7.40%
Projection period 5 years  
Bottom of range [member]    
Disclosure of detailed information about intangible assets [line items]    
Pre-tax discount rate 6.00%  
Top of range [member]    
Disclosure of detailed information about intangible assets [line items]    
Amortisation period of finite-life intangible assets ten years  
Pre-tax discount rate 7.40%