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Risk management - Liquidity risk (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Risk management      
Carrying amount € 3,766   € 4,027
Revolving Credit Facility      
Risk management      
Notional 1,579    
Euro Medium-Term Note Program [member]      
Risk management      
Notional   € 5,000  
Liquidity risk | Revolving Credit Facility      
Risk management      
Notional 1,579   € 1,579
Liquidity risk | Euro Medium-Term Note Program [member]      
Risk management      
Notional 5,000    
Carrying amount 1,250    
Liquidity risk | Local commercial paper program in Finland [member]      
Risk management      
Notional 750    
Carrying amount € 0