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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost € 29 € 28 € 34
Past service cost 1 1
Interest cost (16) (21) (6)
Effect of curtailment or settlement (1)    
Defined benefit plans 13 8 27
Defined contribution plans 423 391 364
Pension and other post-employment benefits 435 399 392
Other staff-related benefits 20 19 (2)
Pension and other staff-related benefits 455 418 390
Net defined benefit asset/liability      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 28 27 33
Past service cost 1 1  
Interest cost (19) (23) (8)
Effect of curtailment or settlement (1)    
Defined benefit plans 9 5 26
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]      
Interest cost 3 2 1
Defined benefit plans € 4 € 3 € 2