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Net Finance Cost - Summary of Net Finance Costs (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Unwinding of discount € (21) € (6)  
Finance costs (728) (821) € (718)
Brazil [Member]      
Statement [Line Items]      
Interest on tax settlement 90 70  
India [Member]      
Statement [Line Items]      
Interest on corporate income tax refund 27  
Changes In Functional Currency      
Statement [Line Items]      
Finance costs € 0 € (40)