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Provisions - Individual Suspension Plan (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]    
Provisions for employee benefits € 6,578 € 7,149
Individual Suspension Plan    
Disclosure of defined benefit plans [line items]    
Provisions for employee benefits € 3,580 € 3,666
Discount rate 1.05%  
Average duration of plans 5 years 2 months 12 days