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Financial risk management - Types of hedges (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Risk management    
Carrying amount of hedging instruments € (222) € (53)
Cash flow hedges    
Risk management    
Carrying amount of hedging instruments 46 (19)
Notional amount of hedged items 1,353 1,201
Change in intrinsic value of hedging instruments since 1 January (12) (43)
Change in value of hedged items used to determine hedge effectiveness 20 40
Cash flow hedges | Short    
Risk management    
Notional amount 1,350 1,196
Hedges on net investment in foreign subsidiaries    
Risk management    
Carrying amount of hedging instruments (9) (11)
Notional amount of hedged items 4,299 2,949
Change in intrinsic value of hedging instruments since 1 January (126) (249)
Change in value of hedged items used to determine hedge effectiveness 126 249
Hedges on net investment in foreign subsidiaries | Short    
Risk management    
Notional amount 4,299 2,949
Fair value hedges    
Risk management    
Carrying amount of hedging instruments (145) (57)
Notional amount of hedged items 1,458 1,577
Change in intrinsic value of hedging instruments since 1 January (111) (95)
Change in value of hedged items used to determine hedge effectiveness 112 92
Fair value hedges | Short    
Risk management    
Notional amount 1,456 1,579
Fair value and cash flow hedges    
Risk management    
Carrying amount of hedging instruments (247) (54)
Notional amount of hedged items (3,438) (891)
Change in intrinsic value of hedging instruments since 1 January (265) (25)
Change in value of hedged items used to determine hedge effectiveness 262 25
Fair value and cash flow hedges | Long    
Risk management    
Notional amount € 3,438 € 891