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Provisions, income tax liabilities and other liabilities - Reconciliation of Net Amount Recognized in Respect of Pension and Other Post-employment Benefit Plans (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]        
Actuarial losses/(gains) due to changes in financial assumptions € 11 € (168) € 622  
Pre-funded pension obligations 156 271 269  
Obligations provided for 5,762 5,262 5,822 € 6,430
UK        
Disclosure of net defined benefit liability (asset) [line items]        
Actuarial losses/(gains) due to changes in demographic assumptions (50) (11) (54)  
Actuarial losses/(gains) due to changes in financial assumptions (210) 43 (1,143)  
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) (212) (44) (131)  
Plan assets | UK        
Disclosure of net defined benefit liability (asset) [line items]        
End of period (204)      
Pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 1,943 1,770    
Current service cost [1] 138 140 193  
Interest (income)/cost [1] 64 71 43  
Plan amendments, curtailments or settlements not specified in the terms of the plan [1] (110) (22) (68)  
Administration costs and taxes paid during the period [1] (13) (7) (6)  
Contributions from plan members [1] 5 6 6  
Net obligation 1,832 1,937 1,752  
Pre-funded pension obligations [2] 156 271 269  
Expense recognized directly in profit or loss [1] 100 190 168  
End of period 1,836 1,943 1,770  
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) [1],[3] (13) 171 (650)  
Expense/(gain) for the period [1] 87 361 (482)  
Pensions and other post-employment benefits | UK        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period (61) (95)    
Current service cost 0 0 0  
Contributions from plan members 0 0 0  
Pre-funded pension obligations   66 99  
Expense recognized directly in profit or loss (1) (5) (13)  
End of period 103 (61) (95)  
Remeasurement of net defined-benefit (asset)/ liability (actuarial gains and losses) 212 44 130  
Pensions and other post-employment benefits | Present value of defined benefit obligation        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 8,930 8,651 12,175  
Current service cost 138 140 193  
Interest (income)/cost 335 346 206  
Actuarial losses/(gains) due to changes in demographic assumptions (45) (34) (219)  
Actuarial losses/(gains) due to changes in financial assumptions (380) 157 (3,006)  
Actuarial losses/(gains) due to experience adjustments (4) 256 177  
Plan amendments, curtailments or settlements not specified in the terms of the plan [3] (181) (36) (229)  
Plan settlements specified in the terms of the plan (59) (40) (84)  
Benefits paid (502) (483) (463)  
Changes in scope of consolidation and transfers 4 (14) (114)  
Currency translation differences 181 (13) 15  
Increase (decrease) in net defined benefit liability (asset) resulting from reclassification, net defined benefit liability (asset) (188) 0 0  
End of period 8,229 8,930 8,651  
Pensions and other post-employment benefits | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period (6,993) (6,899) (9,651)  
Interest (income)/cost (271) (276) (163)  
Plan amendments, curtailments or settlements not specified in the terms of the plan 71 17 161  
Plan settlements specified in the terms of the plan 58 40 84  
Changes in scope of consolidation and transfers 20 8 32  
Currency translation differences (132) (11) 52  
Increase (decrease) in net defined benefit liability (asset) resulting from reclassification, net defined benefit liability (asset) 97 0 0  
Difference between actual return and interest income on plan assets(c) [4] (416) 197 (2,398)  
Administration costs and taxes paid during the period (13) (7) (6)  
Contributions from plan members 5 6 6  
Employer’s contributions 127 122 238  
Benefits paid (456) (446) (426)  
End of period (6,397) (6,993) (6,899)  
Pensions and other post-employment benefits | Plan assets | UK        
Disclosure of net defined benefit liability (asset) [line items]        
Difference between actual return and interest income on plan assets(c) (204)      
Pensions and other post-employment benefits | Effect of asset ceiling        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 6 18    
End of period 4 6 18  
Provisions for pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Obligations provided for 1,992 2,214 2,039 € 2,947
Provisions for pensions and other post-employment benefits | Pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Obligations provided for € 1,992 € 2,214 € 2,039  
[1] (d) Benefit cost for the total Group including Opella on all the periods
[2] (a)For 2023, this line includes €66 million of assets in the United Kingdom (versus €99 million for 2022); those amounts are not subject to any asset ceiling,
in accordance with IFRIC 14.
[3] (b)Amounts recognized in Other comprehensive income (see Note D.15.7.).
[4] (c)In 2024, this line includes the effects of the partial buy-in in the United Kingdom for €(204) million.