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Summary of Significant Accounting Policies - New Accounting Standards Not Yet Adopted (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
IFRS 15 (revenue from contract with customers)        
Sales and marketing $ 8,324 € 6,924 € 6,265 € 5,782
Operating expenses $ 22,341 18,584 16,928 € 16,541
Trade receivables   5,810 € 5,825  
IFRS 15        
IFRS 15 (revenue from contract with customers)        
Contract liabilities, software   100    
Capitalizable sales commission   100    
Sales and marketing   200    
Trade receivables   600    
Contract liabilities   700    
IFRS 15 | Highest        
IFRS 15 (revenue from contract with customers)        
Software revenue   100    
Revenue   100    
Operating expenses   € 100