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Property, plant and equipment - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Commitments to purchase property, plant and equipment € 583 € 356
Short term lease expense 117 105
Low value lease expense 64 74
Income from sublet properties 11 12
Total cash outflows for leases € 465 € 590
Freehold buildings    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Useful life measured as period of time, property, plant and equipment 40 years  
Land and buildings    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Useful life measured as period of time, property, plant and equipment 40 years  
Plant and equipment | Bottom of range    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Useful life measured as period of time, property, plant and equipment 2 years  
Plant and equipment | Top of range    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Useful life measured as period of time, property, plant and equipment 20 years