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Pension and other post-employment benefits - Summary of pension and other staff-related benefit costs (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost € 28 € 34 € 34
Past service cost 1    
Interest cost (21) (6) (4)
Effect of curtailment or settlement     (2)
Defined benefit plans 8 27 28
Defined contribution plans 391 364 369
Pension and other post employment benefits 399 392 397
Other staff related benefits 19 (2) 11
Pension and other staff-related benefits 418 390 408
Net defined benefit asset/liability      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 27 33 33
Past service cost 1    
Interest cost (23) (8) (6)
Defined benefit plans 5 26 27
Other post-employment benefits, net      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Other post-employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Past service cost   (1)  
Interest cost 2 1 2
Effect of curtailment or settlement     (2)
Defined benefit plans € 3 € 2 € 1