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Financial risk management - Types of hedges (Details)
€ in Millions
12 Months Ended
Dec. 31, 2018
EUR (€)
Risk management  
Carrying amount of hedges € (40)
Cash flow hedges  
Risk management  
Carrying amount of hedges (13)
Notional amount of hedged items 1,451
Change in intrinsic value of hedging instruments since 1 January (44)
Change in value of hedged items used to determine hedge effectiveness 45
Cash flow hedges | Short  
Risk management  
Notional amount 1,451
Hedges on net investment in foreign subsidiaries  
Risk management  
Carrying amount of hedges (11)
Notional amount of hedged items 4,129
Change in intrinsic value of hedging instruments since 1 January (83)
Change in value of hedged items used to determine hedge effectiveness 83
Hedges on net investment in foreign subsidiaries | Short  
Risk management  
Notional amount 4,129
Fair value hedges  
Risk management  
Carrying amount of hedges (4)
Notional amount of hedged items 231
Change in intrinsic value of hedging instruments since 1 January (13)
Change in value of hedged items used to determine hedge effectiveness 17
Fair value hedges | Short  
Risk management  
Notional amount 226
Fair value and cash flow hedges  
Risk management  
Carrying amount of hedges (46)
Notional amount of hedged items (2,330)
Change in intrinsic value of hedging instruments since 1 January 9
Change in value of hedged items used to determine hedge effectiveness (7)
Fair value and cash flow hedges | Long  
Risk management  
Notional amount € 2,330