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Provisions, income tax liabilities and other liabilities - Additional Information (Details) € in Millions, $ in Millions | 12 Months Ended |
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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.

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