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Financial Risk Management - Interest Rate Risk Management (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
FINANCIAL RISK FACTORS      
Variable rate and short-maturity investments (as percent) 79.00% 71.00%  
Fixed rate and long-maturity financing (as percent) 71.00% 71.00%  
Fixed-rate financial liabilities (as percent) 49.00% 42.00%  
Interest Rate Risk      
FINANCIAL RISK FACTORS      
Downward yield curve (as a percent) 0.25% 0.50% 0.50%
Derivatives held within a designated fair value hedge relationship      
FINANCIAL RISK FACTORS      
Upward yield curve € (26) € (46) € (105)
Downward yield curve 9 29 62
Variable rate financing      
FINANCIAL RISK FACTORS      
Upward yield curve (5) (21) (39)
Downward yield curve 0 0 € 19
Fair value interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 40 200  
Cash flow interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 3,800 3,310  
Cash flow interest rate risk from financing      
FINANCIAL RISK FACTORS      
Exposure 1,810 2,310  
Cash flow interest rate risk from interest rate swaps      
FINANCIAL RISK FACTORS      
Exposure 1,350 2,220  
Average | Fair value interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 120 80  
Average | Cash flow interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 3,780 3,590  
Average | Cash flow interest rate risk from financing      
FINANCIAL RISK FACTORS      
Exposure 1,940 2,940  
Average | Cash flow interest rate risk from interest rate swaps      
FINANCIAL RISK FACTORS      
Exposure 1,750 2,590  
Highest | Fair value interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 310 200  
Highest | Cash flow interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 4,100 4,380  
Highest | Cash flow interest rate risk from financing      
FINANCIAL RISK FACTORS      
Exposure 2,310 3,310  
Highest | Cash flow interest rate risk from interest rate swaps      
FINANCIAL RISK FACTORS      
Exposure 2,220 2,690  
Lowest | Fair value interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 30 30  
Lowest | Cash flow interest rate risk from investments      
FINANCIAL RISK FACTORS      
Exposure 3,520 3,030  
Lowest | Cash flow interest rate risk from financing      
FINANCIAL RISK FACTORS      
Exposure 1,800 2,310  
Lowest | Cash flow interest rate risk from interest rate swaps      
FINANCIAL RISK FACTORS      
Exposure € 1,350 € 2,220  
U.S. dollar | Interest Rate Risk      
FINANCIAL RISK FACTORS      
Upward yield curve (as a percent) 1.00% 1.00% 1.00%
EUR | Interest Rate Risk      
FINANCIAL RISK FACTORS      
Upward yield curve (as a percent) 0.25% 0.50% 0.50%