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Financial risk management - Interest rate risk (Details) - Interest rate risk
€ in Millions
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Financial instruments by type of interest rate    
Maturity term 3 months  
Increase - Impact on fair value € 34 € 126
Increase - Impact on profit 3 2
Increase - Impact on OCI 4 (1)
Decrease - Impact on fair value (17) (67)
Decrease - Impact on profit (1) € (1)
Decrease - Impact on OCI € (2)  
Interest rates - increase in basis points 1.00 1.00
Interest rates - decrease in basis points 0.50 0.50
Fixed rate    
Financial instruments by type of interest rate    
Other financial assets € 143 € 117
Current financial investments 145 196
Cash and cash equivalents 497 576
Interest-bearing liabilities (3,614) (3,637)
Financial assets and liabilities before derivatives (2,829) (2,748)
Interest rate derivatives 2,332 1,371
Net assets (497) (1,377)
Floating rate    
Financial instruments by type of interest rate    
Other financial assets 68 73
Current financial investments 466 715
Cash and cash equivalents 5,765 6,793
Interest-bearing liabilities (208) (57)
Financial assets and liabilities before derivatives 6,091 7,524
Interest rate derivatives (2,332) (1,371)
Net assets € 3,759 € 6,153