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Property, plant and equipment - Additional Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Expense relating to short-term leases and low value assets € 16 € 19 € 26
Cash outflow for leases, excluding short-term leases € 348 € 315 € 389
Office and industrial premises      
Disclosure of detailed information about property, plant and equipment [line items]      
Leased assets, percentage 90.00%    
Vehicle fleet      
Disclosure of detailed information about property, plant and equipment [line items]      
Leased assets, percentage 10.00%