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Associates and Joint Ventures - Equity Method Investment of Associates (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates [line items]      
Investments accounted for by the equity method at period start € 76    
Translation differences and other comprehensive income (5,422) € 3,152 € (6,762)
Investments accounted for by the equity method at period end 77 76  
Associates and Joint Ventures      
Disclosure of associates [line items]      
Investments accounted for by the equity method at period start 76 80  
Additions 8 17  
Translation differences and other comprehensive income (1) 2  
Income (loss) 5 (5) (10)
Dividends (11) (13)  
Transfers and other   (5)  
Investments accounted for by the equity method at period end € 77 € 76 € 80