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Other Gains / (Losses) - Net - Summary of Other Gains/(Losses) Net (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis of other gains losses [line items]      
Realized gains/(losses) on derivatives   € (62) € (93)
Unrealized gains / (losses) on derivatives at fair value through profit and loss-net € 57 71 (20)
Unrealized exchange (losses) /gains from the remeasurement of monetary assets and liabilities-net (4) 3 (3)
Gains / (Losses) on pension plan amendments 20   (5)
Losses on disposal (3) (10) (5)
Wise purchase price adjustment   20  
Wise acquisition costs     (5)
Other   (1)  
Total other gains / (losses)-net € 70 21 € (131)
Wise Metals Intermediate Holdings LLC [member]      
Analysis of other gains losses [line items]      
Wise purchase price adjustment   € 20