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Discontinued operations - Cash flows (Details) - Discontinued operations - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from Discontinued operations      
Net cash used in operating activities € (33) € (14) € (10)
Net cash from/(used in) investing activities 10 (16) 3
Net cash flow for the period € (23) € (30) € (7)