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Risk management - Interest rate risk (Details) - Interest rate risk
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Financial instruments by type of interest rate    
Maturity term 3 months  
Increase - Impact on fair value € 126 € 181
Increase - Impact on profit 2 (3)
Increase - Impact on OCI (1) (2)
Decrease - Impact on fair value (67) (99)
Decrease - Impact on profit € (1) 2
Decrease - Impact on OCI   € 1
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    
Assets € 889 € 2,107
Liabilities (3,637) (3,845)
Assets and liabilities before derivatives (2,748) (1,738)
Interest rate derivative, net 1,371 1,358
Net assets (1,377) (380)
Floating rate(1)    
Financial instruments by type of interest rate    
Assets 7,581 7,410
Liabilities (57) (113)
Assets and liabilities before derivatives 7,524 7,297
Interest rate derivative, net (1,371) (1,328)
Net assets € 6,153 € 5,969