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Consolidated Statement of Comprehensive Income (Parenthetical) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of comprehensive income [Abstract]      
Fair value gains/(losses) on net investment hedges and exchange differences in net investments in foreign operations € (909) € (365) € 617