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Other information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Current assets € 39,450 € 36,433  
Non-current assets 78,628 78,172  
Net borrowings 11 (10,916)  
Fair value of investments held before the acquisition of control 50    
Gain on a bargain purchase (8)    
Purchase price 148    
Investment in consolidated subsidiaries and businesses net of cash and cash equivalent 119    
Net effect of disposals 206    
Non-controlling interest (57) (49)  
Cash And Cash Equivalents Divested 29    
Current And Non Current Liabilities (47)    
Disposal Of Consolidated Subsidiaries And Businesses [Member]      
Statement Line Items [Line Items]      
Current assets 328 166 € 6,526
Non-current assets 5,079 814 8,615
Net borrowings 785 252 5,415
Net effect of disposals 2,722 523 3,392
Reclassification of foreign currency translation differences among other items of comprehensive income   7
Fair value of share capital held after the sale of control     (1,006)
Gain on disposal 2,148 11
Non-controlling interest   (1,872)
Selling price   2,671 532
Disposal of consolidated subsidiaries and businesses net of cash and cash equivalent divested (47) 2,662 (362)
Cash And Cash Equivalents Divested 286 9 894
Current And Non Current Liabilities (3,470) € (205) € (6,334)
Fair valuation of business combination € 889