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Trade Payables and Other Liabilities - Additional Information (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of trade and other liabilities [line items]    
Deferred consideration € 187 € 511
Balance for deferred contingent consideration 142 € 445
Maximum possible total payment 1,082  
Non-cash credit to operating profit 277  
Blueair [member]    
Disclosure of trade and other liabilities [line items]    
Non-cash credit to operating profit 277  
cash payment for contingent consideration € 122