v3.19.3.a.u2
Revenue Recognition - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contract Liabilities [Abstract]      
Deferred revenue € 319 € 258  
Description of when entity typically satisfies performance obligations over a period up to a year    
Revenue recognition € 248 € 210 € 149