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Property, plant and equipment - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Commitments to purchase property, plant and equipment € 356 € 386
Short term lease expense 105 96
Low value lease expense 74 71
Income from sublet properties 12 16
Total cash outflows for leases € 590 € 535
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