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Other Gains / (Losses)-Net - Summary of Other Gains/(Losses) Net (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]      
Realized gains / (losses) on derivatives € 14   € (62)
Unrealized (losses) / gains on derivatives at fair value through profit and loss-net (84) € 57 71
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities-net   (4) 3
Gains on pension plan amendments 36 20  
Gains / (losses) on disposal 186 (3) (10)
Wise purchase price adjustment     20
Other 2   (1)
Total other gains / (losses)-net € 154 € 70 € 21