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Summary of Significant Accounting Policies - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Summary of significant accounting policies [line items]        
Loss allowance recognized in opening retained earnings net of tax € 2 € 0    
Business combination description Recognized assets and liabilities may be adjusted during a maximum of 12 months from the acquisition date, depending on new information obtained about the facts and circumstances existing at the acquisition date.      
Interest cost on pension and other benefits € 15 € 17 € 21  
Technology [member]        
Summary of significant accounting policies [line items]        
Intangible assets amortized estimated useful life 20 years      
Customer relationships [member]        
Summary of significant accounting policies [line items]        
Intangible assets amortized estimated useful life 25 years      
IFRS 16 [member]        
Summary of significant accounting policies [line items]        
Right-of-use assets expect to recognize       € 102
Lease liabilities expect to recognize       € 102
Bottom of range [member] | Computer software [member]        
Summary of significant accounting policies [line items]        
Intangible assets amortized estimated useful life 3 years      
Bottom of range [member] | Buildings [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 10 years      
Bottom of range [member] | Machinery and equipment [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 3 years      
Bottom of range [member] | Vehicles [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 5 years      
Top of range [member] | Computer software [member]        
Summary of significant accounting policies [line items]        
Intangible assets amortized estimated useful life 5 years      
Top of range [member] | Buildings [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 50 years      
Top of range [member] | Machinery and equipment [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 40 years      
Top of range [member] | Vehicles [member]        
Summary of significant accounting policies [line items]        
Property, plant and equipment, useful life 8 years