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Employees - Schedule of Charges Related to Equity-Settled Plans (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Share Based Compensation Plans [Line Items]      
Income statement charge € (108) € (151) € (196)
Performance share plans [Member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Income statement charge (98) (142) (183)
Other plans [Member]      
Disclosure of Share Based Compensation Plans [Line Items]      
Income statement charge € (10) € (9) € (13)