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Other Assets and Receivables - Summary of Movements in Provision for Doubtful Debts (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Other Assets And Receivables [abstract]    
Beginning balance € (41) € (48)
Additions charged to earnings (9) (7)
Unused amounts reversed through the income statement 8 4
Disposal of business 4  
Used during the year 5 10
Ending balance € (34) € (41)