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Provisions, income tax liabilities and other liabilities - Additional Information (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Country
age
plan
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
EUR (€)
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Number of major countries included in pension obligations | Country 4          
Pension obligation, percentage to defined benefit liability 88.00%          
Pension obligations, percentage to plan assets 87.00%          
Employee termination benefits € 1,318 € 968 € 1,039      
Average residual holding periods 2 years 2 months 4 days 2 years 2 months 19 days 2 years 7 months 6 days      
Non-current income tax liabilities € 1,512 € 1,842 € 1,979      
Other non-current liabilities [1] € 2,334 € 2,340 519      
Liability recognized representing the estimated cost | $         $ 1,092  
Tax charge on deemed repatriation attributable to accumulated earnings payable period 8 years          
Mortality table            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Possible increase in mortality table (in years)   1 year        
US legal restructuring            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Unused capital losses for which no deferred tax asset recognised       € 3,000    
Capital losses, carry back period       3 years    
Percentage of capital losses used       33.33%    
Later than 12 months            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Other non-current liabilities   € 247 459      
Other environment related provision            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Identified environmental risks provisions estimated obligation period 30 years          
Other provisions, expected utilized amount in 2022 € 67          
Other provisions, expected utilized amount in 2023 through 2026 203          
Greenhouse Gas Emission            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Provision Recognised 1          
Uncertainties over income tax treatments            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Non-current income tax liabilities 1,512 1,595 1,520      
France            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits € 862 611 804      
US            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Number of types of defined-benefit plan | plan 2          
UK            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Retirement age | age 65          
Notional retirement age | age 60          
UK | Plan assets            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Net amount shown in the balance sheet at end of period € (204)          
UK | Bottom of range            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Vesting right percentage 1.25%          
UK | Top of range            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Vesting right percentage 1.50%          
Lump-sum retirement benefit plans | France            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 38.00%          
Defined benefit pension plans | France            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 62.00%          
Defined benefit pension plans | US | Qualified defined benefit pension plans            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 57.00%          
Defined benefit pension plans | US | Non qualified defined benefit pension plans            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 16.00%          
Defined benefit pension plans | UK            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 100.00%          
Top-up defined-benefit pension plan | Germany            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 61.00%          
Sanofi-Aventis Plus | Germany            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employer's contribution percentage 14.00%          
Multi-employer plan (Pensionskasses) | Germany            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 26.00%          
Employee termination benefits € 682 744 652      
Healthcare Cover And Life Insurance | US            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligation, percentage to defined benefit liability 27.00%          
Employee termination benefits € 381          
Healthcare Cover And Life Insurance | US | Plan assets            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Pension obligations, percentage to plan assets 3.00%          
Net amount shown in the balance sheet at end of period € 20          
Pensions and other post-employment benefits            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits 8,229 8,930 8,651      
Net amount shown in the balance sheet at end of period 1,836 1,943 1,770      
Pensions and other post-employment benefits | Plan assets            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Net amount shown in the balance sheet at end of period (6,397) (6,993) (6,899)     € (9,651)
Difference between actual return and interest income on plan assets(c) [2] (416) 197 (2,398)      
Pensions and other post-employment benefits | France            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits 1,228 1,322 1,324      
Net amount shown in the balance sheet at end of period 561 647 627      
Pensions and other post-employment benefits | Germany            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits 2,651 2,911 2,730      
Net amount shown in the balance sheet at end of period 412 510 413      
Pensions and other post-employment benefits | US            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits 1,427 1,528 1,546      
Net amount shown in the balance sheet at end of period 683 703 686      
Pensions and other post-employment benefits | UK            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Employee termination benefits 1,994 2,174 2,080      
Net amount shown in the balance sheet at end of period 103 € (61) € (95)      
Pensions and other post-employment benefits | UK | Plan assets            
Provisions And Other Current And Non-Current Liabilities [Line Items]            
Difference between actual return and interest income on plan assets(c) € (204)          
[1] (a)Includes derivative financial instruments: €121 million as of December 31, 2024, €164 million as of December 31, 2023, €232 million as of December 31,
2022.
The figure as of December 31, 2024 includes €2,007 million for the liability in respect of royalties payable to Sobi on net sales of Beyfortus (nirsevimab) in
the United States (see Note C.2.). Given the method used to calculate royalties payable, an increase or decrease in sales forecasts would lead to a
proportionate change in the amount of the liability. The nominal value of payments estimated to be due within more than one year but less than five
years is €1,140 million; the nominal value of payments estimated to be due after more than five years is €2,792 million.
[2] (c)In 2024, this line includes the effects of the partial buy-in in the United Kingdom for €(204) million.