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Commitments and contingent liabilities - Summary of Potential Future Lease Commitments and Other Commitments Fall Due (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Lease And Other Commitments [Line Items]    
Leases € 169 € 158
Other Commitments 3,288 1,556
Volume commitments   3,530
Current volume commitments   1,150
Within 1 year    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 56 69
Other Commitments 1,233 844
Later than 1 year but not later than 5 years    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 90 80
Other Commitments 1,554 694
Later than 5 years    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 23 9
Other Commitments € 501 € 18