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Other information (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Current assets € 36,433 € 37,971  
Non-current assets 78,172 86,560  
Net borrowings (24,707) (27,239)  
Non-controlling interest (49) (49)  
Disposal Of Consolidated Subsidiaries And Businesses [Member]      
Statement Line Items [Line Items]      
Current assets 166 6,526 € 44
Non-current assets 814 8,615 125
Net borrowings (252) (5,415) (77)
Current and non-current liabilities (205) (6,334) (45)
Net effect of disposals 523 3,392 47
Reclassification of foreign currency translation differences among other items of comprehensive income   7 (34)
Fair value of share capital held after the sale of control   (1,006)  
Gain on disposal 2,148 11 66
Non-controlling interest   (1,872)  
Selling price 2,671 532 79
Cash and cash equivalents (9) (894) (6)
Disposal of consolidated subsidiaries and businesses net of cash and cash equivalent € 2,662 € (362) € 73