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Non Cash Investing & Financing Transactions - Additional Information (Detail) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Non Cash Investing And Financing Transactions [abstract]    
Property, plant and equipment acquired by finance lease € 33 € 1
Fair value of PSU and RSUs vested € 4 € 3