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Financial risk management - Effects of hedge accounting (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Risk management    
Carrying amount of hedging instruments € (148) € (222)
Cash flow hedges    
Risk management    
Carrying amount of hedging instruments 2 46
Notional amount of hedging instruments 968 1,350
Notional amount of hedged items 968 1,353
Change in intrinsic value of hedging instruments since 1 January 22 (12)
Change in value of hedged items used to determine hedge effectiveness (15) 20
Net investment hedges    
Risk management    
Carrying amount of hedging instruments 5 (9)
Notional amount of hedging instruments 1,166 4,299
Notional amount of hedged items 1,166 4,299
Change in intrinsic value of hedging instruments since 1 January 132 (126)
Change in value of hedged items used to determine hedge effectiveness (132) 126
Fair value hedges for FX risk    
Risk management    
Carrying amount of hedging instruments (45) (145)
Notional amount of hedging instruments 1,354 1,456
Notional amount of hedged items 1,354 1,458
Change in intrinsic value of hedging instruments since 1 January 40 (111)
Change in value of hedged items used to determine hedge effectiveness (42) 112
Fair value and cash flow hedges    
Risk management    
Carrying amount of hedging instruments (174) (247)
Notional amount of hedging instruments 3,205 3,438
Notional amount of hedged items (3,205) (3,438)
Change in intrinsic value of hedging instruments since 1 January 89 (265)
Change in value of hedged items used to determine hedge effectiveness € (93) € 262