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Liquidity - Private Placement Transactions (Details)
€ in Millions, $ in Millions
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
Financial Liabilities        
Effective Interest Rate 0.83% 0.83% 0.87% 1.09%
Carrying Amount € 13,005   € 13,344  
Private placements        
Financial Liabilities        
Carrying Amount € 790   742  
Tranche 7-2012        
Financial Liabilities        
Coupon Rate 3.18% 3.18%    
Effective Interest Rate 3.22% 3.22%    
Nominal Volume | $   $ 444.5    
Carrying Amount € 396   373  
Tranche 8-2012        
Financial Liabilities        
Coupon Rate 3.33% 3.33%    
Effective Interest Rate 3.37% 3.37%    
Nominal Volume | $   $ 323.0    
Carrying Amount € 300   281  
Tranche 9-2012        
Financial Liabilities        
Coupon Rate 3.53% 3.53%    
Effective Interest Rate 3.57% 3.57%    
Nominal Volume | $   $ 100.0    
Carrying Amount € 94   € 88