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Subsequent Events (Details) - Gestra [Member] - EUR (€)
€ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]    
Disposal Group, Not Discontinued Operation, Consideration € 186  
Disposal Group, Not Discontinued Operation, Revenue   € 92
Disposal Group, Not Discontinued Operation, Income Tax   € 15
Disposal Group, Not Discontinued Operation, Estimated Gain (Loss) on Disposal € 40