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Other liabilities - Text Details (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other liabilities [Abstract]    
Other non-current non-financial liabilities € 74 € 71
Non-current contract liabilities 403 348
Current contract liabilities 1,239 € 1,170
Increase (Decrease) in current contract liabilities through operational activities 70  
Revenue that was included in contract liability balance at beginning of period € 1,170