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Property, plant and equipment - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Commitments to purchase property, plant and equipment € 386 € 251
Short term lease expense 96 96
Low value lease expense 71 77
Income from sublet 16 19
Total cash outflows for leases € 535 € 525
freehold buildings (no depreciation on freehold land)    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Useful life measured as period of time, property, plant and equipment 40 years  
leasehold 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