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Treasury risk management - Summary of Currency Derivatives Outstanding (Details) - Cash flow hedges - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 1,416 991
EUR    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 951 958
GBP    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 372 408
USD    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 363 764
SEK    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 97 103
CAD    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 136 86
PLN    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 42 64
Others    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument 181 136