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Commitments - Capital Expenditures Commitments (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of capital expenditures commitments [line items]    
Capital expenditure commitments € 124 € 101
Computer software [member]    
Disclosure of capital expenditures commitments [line items]    
Capital expenditure commitments 1 2
Property, plant and equipment [member]    
Disclosure of capital expenditures commitments [line items]    
Capital expenditure commitments € 123 € 99