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Cash and cash equivalents (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
Cash and cash equivalents € 10,836 [1] € 7,363 [1] € 5,674 € 5,209
Short-term deposits, classified as cash equivalents 8,732 € 5,591    
Euro [Member]        
Short-term deposits, classified as cash equivalents € 7,653      
Avearge Maturity Period 29 days      
Internal Rate Of Return 0.29%      
US Dollars [Member]        
Short-term deposits, classified as cash equivalents € 1,074      
Avearge Maturity Period 12 days      
Internal Rate Of Return 2.59%      
[1] Cash and cash equivalents as of December 31, 2018, include €19 million of cash and cash equivalents of consolidated subsidiaries held for sale that were reported in the item Assets held for sale in the balance sheet