Dividends received from non-consolidated entities Dividends Received From Nonconsolidated Entities Classified As Operating Activities Dividends received from non-consolidated entities. Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Number of categories Income Statement Classification, IFRS 18, Number Of Categories Number Of Categories Other changes arising from issuance of restricted shares Increase (Decrease) Through Issuance Of Restricted Shares, Equity Increase (decrease) through issuance of restricted shares, equity. Acquisitions of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument of which Singapore dollar Forward Currency Purchases In Singapore Dollar [Member] Forward currency purchases in Singapore Dollar. Change in business operating income, on a reported basis (IFRS), percentage Increase (Decrease) In Business Operating Income, On A Reported Basis (IFRS), Percentage Increase (Decrease) In Business Operating Income, On A Reported Basis (IFRS), Percentage pay capitalized Ester/receive 0.92% Interest Rate Swaps Pay Capitalized Ester / Receive 0.92% [Member] Interest Rate Swaps Pay Capitalized Ester / Receive 0.92% Disclosure of detailed information about business combination [line items] Disclosure of detailed information about business combination [line items] Impairment of intangible assets Impairment loss on other intangible assets Impairment loss recognised in profit or loss, intangible assets other than goodwill Deferred taxes Deferred tax expense (income) Continuing operations Comprehensive income from continuing operations, attributable to owners of parent to equity holders of Sanofi Dividends paid to equity holders of parent, classified as financing activities Net defined benefit liability (asset) [Axis] Net defined benefit liability (asset) [axis] 2028 Later than two years and not later than three years [member] Cash and cash equivalents [abstract] pay capitalized SOFR USD/ receive 1.32% Interest Rate Swaps Pay Capitalized USD SOFR / Receive 1.32% [Member] Interest Rate Swaps Pay Capitalized USD SOFR / Receive 1.32% Cash flow hedges and fair value hedges: Cash Flow And Fair Value Hedge [Member] Cash Flow And Fair Value Hedge Overdue by 6-12 months Later than six months and not later than one year [member] Net interest cost related to employee benefits Net Interest Cost Related To Employee Benefits Net interest cost related to employee benefits. Finance income (cost) Net financial income/(expenses) Finance income (cost) Borrowing, average drawdown Borrowing, Average Drawdown Borrowing, Average Drawdown Ranges of exercise prices for outstanding share options [axis] Ranges of exercise prices for outstanding share options [axis] Acquisitions of other equity investments Purchase of financial instruments, classified as investing activities Disclosure of detailed information about borrowings [Table] Disclosure of detailed information about borrowings [table] Summary of Analysis of Financial Income and Expenses Disclosure Of Financial Income And Expenses Explanatory [Table Text Block] The entire disclosure for financial income and expenses. Statement of comprehensive income [abstract] Statement of comprehensive income [abstract] Discontinued Operations [Abstract] Discontinued Operations Statement of changes in equity [line items] Statement of changes in equity [line items] Basic earnings per share from continuing operations (in euros per share) Basic earnings (loss) per share from continuing operations Other Other Liabilities1 [member] Other liabilities. Disclosure of other revenue Disclosure of other revenue [Text Block] Disclosure of other revenue [Text Block] Disclosure of geographical areas [table] Disclosure of geographical areas [table] (Increase)/decrease in accounts receivable Adjustments for decrease (increase) in trade accounts receivable Industrial sales Industrial Sales [Member] Industrial Sales Summary of Movements in Liabilities Related to Business Combinations and to Non-Controlling Interests Disclosure Of Changes In Liabilities Related To Business Combinations And To Noncontrolling Interests [Table Text Block] The disclosure of changes in liabilities related to business combinations and to non-controlling interests. Statement of financial position [abstract] Statement of financial position [abstract] of which Hungarian forint Forward Currency Purchases In Hungarian florint [Member] Forward Currency Purchases In Hungarian florint Disclosure of Remeasurement of Net Defined Benefit Liability Asset Disclosure Of Remeasurement Of Net Defined Benefit Liability Asset [Table Text Block] Disclosure Of Remeasurement Of Net Defined Benefit Liability Asset Cover [Abstract] Cover [Abstract] Acquisitions of treasury shares and related tax effect Payments to acquire or redeem entity's shares Payments to acquire or redeem entity's shares Ayvakit Ayvakit [Member] Ayvakit Maximum Maximum [Member] Defined benefit plans [Axis] Defined benefit plans [axis] Two billion three hundred million bonds Two Billion Three Hundred Million Bonds [Member] Two Billion Three Hundred Million Bonds Reversals of unutilized provisions Unused provision reversed, other provisions Classes of intangible assets other than goodwill [axis] Classes of intangible assets other than goodwill [axis] Cash flows from (used in) financing activities [abstract] Cash flows from (used in) financing activities [abstract] Disclosure of Other Operating Income Expenses [Table] Disclosure Of Other Operating Income Expenses [Table] Disclosure of other operating income expenses. pay 3.77% / receive capitalized SOFR + 46bps Interest Rate Swaps Pay 3.77% / Receive Capitalized SOFR + 46bps [Member] Interest Rate Swaps Pay 3.77% / Receive Capitalized SOFR + 46bps Classes of liabilities [domain] Classes of liabilities [domain] Actuarial gains/(losses) on benefit obligations Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income Interest rate and currency derivatives used to hedge debt Interest Rate And Currency Derivatives [Member] Interest rate and currency derivatives used to hedge debt. Restructuring and similar costs Restructuring Costs and Other Items of Acquiree Since Acquisition Date Restructuring Costs and Other Items of Acquiree Since Acquisition Date Change in fair value (investments accounted for using the equity method, net of taxes) Change In Fair Value On Equity Instruments For Investments Accounted For Using The Equity Method Net Of Tax Change In Fair Value On Equity Instruments For Investments Accounted For Using The Equity Method Net Of Tax Comprehensive income Comprehensive income Diluted earnings per share from continuing operations (in euros per share) Diluted earnings (loss) per share from continuing operations Number of one-year extension options Number Of One-Year Extension Options Number Of One-Year Extension Options Basis of preparation of the half-year financial statements and accounting policies Disclosure of basis of preparation of financial statements [text block] Employees share ownership plan Employee Share Ownership Plan [Member] Employees share ownership plan. Document Fiscal Period Focus Document Fiscal Period Focus Total assets Assets Net gains / (losses) on disposals of operating assets or businesses Gains (Loss) On Divestment Of Products Gains on divestment of products. Disclosure Of Other Non Current Assets [Line Items] Disclosure Of Other Non-Current Assets [Line Items] Disclosure of other non-current assets. Change in currency translation differences Gains (losses) on exchange differences on translation of foreign operations, before tax Associates [domain] Associates [domain] Share Capital, Reserves And Other Equity Interest [Abstract] Share Capital, Reserves And Other Equity Interest [Abstract] Share Capital, Reserves And Other Equity Interest [Abstract] Accounts receivable and other receivables Amounts receivable, related party transactions Period of share repurchase program Share Repurchase Program, Period Period of share repurchase program. Litigation and arbitration proceedings Disclosure Of Legal And Arbitral Proceedings [Text Block] Disclosure Of Legal And Arbitral Proceedings [Text Block] Disclosure of detailed information about business combination [abstract] Disclosure of detailed information about business combination [abstract] Adjustments for non current financial assets and deferred tax expense Adjustments For Non Current Financial Assets and Deferred Tax Expense Adjustments For Non Current Financial Assets and Deferred Tax Expense Types Of Agreement [Axis] Types Of Agreement [Axis] Types Of Agreement Market Condition [Domain] Market Condition [Domain] Market Condition [Domain] Share capital Issued capital [member] Other non-current liabilities Other non-current liabilities Other provisions [Member] Classes of other provisions [domain] Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] Other bank borrowings Other Bank Borrowings Other bank borrowings. Disclosure Of Non-current Provisions [Line Items] Disclosure Of Non-Current Provisions [Line Items] Disclosure Of Non-current Provisions [line items] Actuarial gains/(losses) excluding investments accounted for using the equity method Actuarial Gains (Losses) Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset Excluding Associates And Joint Ventures Actuarial gains (losses) arising from changes in financial assumptions net defined benefit liability asset excluding associates and joint ventures. Biopharma Biopharma Segment [Member] Pharmaceuticals segment. Interest income Interest Income Interest Income Disclosure of detailed information about finance income expense [Line Items] Disclosure Of Detailed Information About Finance Income Expense [Line Items] Line items represent detailed information about finance income expense. Introduction Disclosure of general information about financial statements [text block] Revisions to tax exposures and settlements of tax disputes Revisions To Tax Exposures And Settlements Of Tax Disputes Revisions to tax exposures and settlements of tax disputes. Disclosure of reconciliation of changes in goodwill [line items] Disclosure of reconciliation of changes in goodwill [line items] Under 2026 plans Restricted Share Plan 2026 [Member] Restricted Share Plan 2026 Net change in other current assets and other current liabilities Net Change In Other Current Assets And Other Current Liabilities Adjustments for decrease (increase) in other current assets and increase (decrease) in other current liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. Tax on share cancellations Taxes on Share Cancellations Taxes on Share Cancellations Chief executive officer Chief Executive Officer [Member] Dupixent Dupixent [Member] Dupixent [member] Exercise price of outstanding options (in euros per share) Exercise price of outstanding share options Assets Assets [abstract] Talc product litigation in the US Talc Product Litigation In The US [Member] Talc Product Litigation In The US       As % of net sales Business Operating Income As Percent Of Net Sales Business Operating Income As Percent Of Net Sales Disclosure Of Other Operating Income Expenses [Line Items] Disclosure Of Other Operating Income Expenses [Line Items] Disclosure of other operating income (expenses). Per share value of shares repurchased (in euros per share) Per Share Value of Shares Repurchased Per Share Value of Shares Repurchased Disposals and other decreases Disposals and retirements, intangible assets other than goodwill Number of shares subscribed (in shares) Number Of Shares Subscribed Number of shares subscribed. Revenue [abstract] Revenue [abstract] Non-current assets [abstract] Non-current assets [abstract] Cash and cash equivalents Cash and cash equivalents recognised as of acquisition date Income tax expense Disclosure of income tax [text block] Toujeo Toujeo [Member] Toujeo. Without market condition Without Market Condition [Member] Without Market Condition Other Other finance income (cost) CD&R CD&R [Member] CD&R Disclosure of impairment loss and reversal of impairment loss [table] Disclosure of impairment loss and reversal of impairment loss [table] Opella Business Opella Business [Member] Opella Business [Member] Software Computer software [member] Other financial assets at fair value through profit or loss Other Financial Assets At Fair Value Through Profit Or Loss Other Financial Assets At Fair Value Through Profit Or Loss Disclosure of impairment loss and reversal of impairment loss [line items] Disclosure of impairment loss and reversal of impairment loss [line items] Disclosure of analysis of other comprehensive income by item [Line Items] Disclosure of analysis of other comprehensive income by item [line items] Stock options and other share-based payments Reserve of share-based payments [member] pay capitalized Ester / receive 2.91% Interest Rate Swaps Pay Capitalized Ester / Receive 2.91% [Member] Interest Rate Swaps Pay Capitalized Ester / Receive 2.91% Cash flows from (used in) investing activities [abstract] Cash flows from (used in) investing activities [abstract] Net change in deferred taxes Adjustments for deferred tax expense Under 2022 plans Restricted Share Plan 2022 [Member] Restricted Share Plan 2022 Disclosure of Legal and Arbitral Proceedings [Line Items] Disclosure Of Legal And Arbitral Proceedings [Line Items] Disclosure of legal and arbitral proceedings. pay 2.08% / receive Euribor 3M Interest Rate Swaps Pay 2.08%/Receive Euribor 3M [Member] Interest Rate Swaps Pay 2.08%/Receive Euribor 3M Forward currency sales Forward Currency Sales [Member] Forward currency sales. Discontinued operations Comprehensive income from discontinued operations, attributable to owners of parent Number of shares (in shares) Number Of Shares Held Number of shares held. Notional amount At Notional Amount [member] At notional amount. Other All other segments [member] Disclosure of Instruments Disclosure Of Interest Rates Hedging Instruments With Notional Amount By Expiry Date Explanatory [Table Text Block] The disclosure of interest rates hedging instruments with notional amount by expiry date. Basic earnings per share from discontinued operations (in euros per share) Basic earnings (loss) per share from discontinued operations Non-current assets Non-current assets Proportion of ownership interest in associate Proportion of ownership interest in associate Reconciliation of changes in other provisions [abstract] Reconciliation of changes in other provisions [abstract] Net cash provided by/(used in) continuing operating activities Cash flows from (used in) operating activities, continuing operations Changes in scope of consolidation Increase (Decrease) Through Changes In Scope Of Consolidation, Other Provisions Increase (Decrease) Through Changes In Scope Of Consolidation, Other Provisions Fabrazyme Fabrazyme [Member] Fabrazyme [Member] Summary of accounts receivable Disclosure Of Current Trade Receivables [Table Text Block] The disclosure of current trade receivables. Other operating income and expenses Disclosure of other operating income (expense) [text block] Number of short-term debt programs Number Of Short-Term Debt Program Number Of Short-Term Debt Program Change in fair value (excluding investments accounted for using the equity method) Change In Fair Value On Equity Instruments Excluding Associates And Joint Ventures Change In Fair Value On Equity Instruments Excluding Associates And Joint Ventures Classes of property, plant and equipment [Axis] Classes of property, plant and equipment [axis] Change in research and development expenses, on a reported basis (IFRS), percentage Increase (Decrease) In Research And Development Expenses, On A Reported Basis (IFRS), Percentage Increase (Decrease) In Research And Development Expenses, On A Reported Basis (IFRS), Percentage Number of cases filed in New Jersey court Number Of Cases Filed In New Jersey Court Number Of Cases Filed In New Jersey Court Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Actuarial assumptions [domain] Actuarial assumptions [domain] Overdue by less than 1 month Not later than one month [member] Of which total launches Launches [Member] Launches Change in selling and general expenses, on a reported basis (IFRS), percentage Increase (Decrease) In Selling And General Expenses, On A Reported Basis (IFRS), Percentage Increase (Decrease) In Selling And General Expenses, On A Reported Basis (IFRS), Percentage Investments in joint ventures Investments in joint ventures accounted for using equity method Impact of exchange rates on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Number of legal decision aspects challenged Number Of Legal Decision Aspects Challenged Number Of Legal Decision Aspects Challenged of which Singapore dollar Forward Currency Sales In Singapore Dollar [member] Forward currency sales in Singapore Dollar. From €60.00 to €70.00 per share Exercise Price Range Two [Member] Exercise Price Range Two [Member] Entities [Table] Entities [Table] Rest of the World Other Countries, Excluding Europe And North America [Member] Other Countries, Excluding Europe And North America Increase in actuarial assumption Percentage of reasonably possible increase in actuarial assumption Other comprehensive income/(loss) from continuing operations for the period, net of taxes (A+B) Other comprehensive income from continued operations Other comprehensive income from continued operations Actuarial gains/(losses) on plan assets Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense Net income from discontinued operations Profit (loss) from discontinued operations attributable to ordinary equity holders of parent entity, used in calculating basic earnings per share Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] MCM Vaccine BV MCM Vaccine BV [Member] MCM Vaccine BV Geographical areas [Member] Geographical areas [domain] Gains and losses on disposals of non-current assets, net of tax Adjustments for losses (gains) on disposal of non-current assets Operating income of acquiree since acquisition date Operating Income Of Acquiree Since Acquisition Date Operating Income Of Acquiree Since Acquisition Date Revenue from contracts with customers Disclosure of revenue [text block] Other non-current assets Disclosure of other non-current assets [text block] Change in fair value of debt instruments included in financial assets Gains (Losses) On Remeasuring Debt Instruments, Before Tax Gains (Losses) On Remeasuring Debt Instruments, Before Tax Medley Medley [Member] Medley Disclosure of attribution of expenses by nature to their function [line items] Disclosure of attribution of expenses by nature to their function [line items] Tax effects Income Tax Relating To Actuarial Gains (Losses) Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset Excluding Equity Investments Income Tax Relating To Actuarial Gains (Losses) Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset Excluding Equity Investments Attributable to equity holders of Sanofi Equity attributable to owners of parent [member] Business operating income Business operating income Business Operating Income Business operating income. Financial expenses Finance costs Net interest related to employee benefits, and unwinding of discount Increase (Decrease) Through Net Interest Related To Employees Benefits And Unwinding Of Discount, Other Provisions Net interest related to employees benefits and unwinding of discount. Net (income)/loss from the discontinued Opella business Adjustments for losses (gains) on transfer of business Adjustments for losses (gains) on transfer of business Actuarial gains and losses on defined-benefit plans Increase (Decrease) Through Actuarial Gains And Losses On Defined Benefit Plans, Other Provisions Actuarial gains and losses on defined-benefit plans. Not eligible for hedge accounting Not Eligible For Hedge Accounting [Member] Not eligible for hedge accounting. Disclosure of Legal and Arbitral Proceedings [Table] Disclosure Of Legal And Arbitral Proceedings [Table] Disclosure of legal and arbitral proceedings. Royalties Royalty income Entity Central Index Key Entity Central Index Key Items subsequently reclassifiable to profit or loss Other comprehensive income that will be reclassified to profit or loss, net of tax Number of options, outstanding (in shares) Number of share options outstanding in share-based payment arrangement Excluding general director Excluding Chief Executive Officer [Member] Excluding Chief Executive Officer Regeneron Regeneron [Member] Regeneron Summary of Allocation of Income Tax Expense Between Current and Deferred Taxes Disclosure Of Allocation Of Income Tax Between Current And Deferred Taxes [Table Text Block] The disclosure of allocation of income tax between current and deferred taxes. Equity and liabilities Equity and liabilities [abstract] Legal And Arbitral Proceedings [Domain] Legal And Arbitral Proceedings [Domain] [Domain] for Legal And Arbitral Proceedings [Axis] Commercial paper program in USA Commercial Paper Program In USA [Member] Commercial paper program in USA. Change in fair value of cash flow hedges Gains (losses) on cash flow hedges, before tax Liabilities related to business combinations and to non-controlling interests Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests Explanatory [Text Block] The entire disclosure for liabilities related to business combination and to non-controlling interests. Swedish Orphan Biovitrum AB Swedish Orphan Biovitrum AB [Member] Swedish Orphan Biovitrum AB Non-current provisions and other non-current liabilities Disclosure Of Provisions And Other Non-Current Liabilities [Text Block] Disclosure Of Provisions And Other Non-Current Liabilities Issuance of restricted shares and vesting of existing restricted shares Increase (Decrease) Through Share-Based Payment Plans Issuance Of Restricted Shares And Vesting Of Existing Restricted Shares Increase (decrease) through share-based payment plans issuance of restricted shares and vesting of existing restricted shares. Cerezyme Cerezyme [Member] Cerezyme. Kali Therapeutics License Agreement Kali Therapeutics License Agreement [Member] Kali Therapeutics License Agreement Financial Instruments [Abstract] Financial Instruments [Abstract] Financial Instruments [Abstract] Acquisitions Additions other than through business combinations, property, plant and equipment pay 3.82% / receive capitalized SOFR USD + 54 bps Interest Rate Swaps Pay 3.82% / Receive Capitalized SOFR USD + 54 bps [Member] Interest Rate Swaps Pay 3.82% / Receive Capitalized SOFR USD + 54 bps Operating income Profit (loss) from operating activities Schedule of Reconciliation Between Business Operating Income for the Segments and Income Before Tax and Investments Accounted for Using the Equity Method Disclosure Of Operating Segments Reconciling Items [Table Text Block] The disclosure of operating segments reconciling items. Cost of net debt Cost Of Debt Net Cost of debt net. University of Washington and Harborview medical center University Of Washington And Harborview Medical Center [Member] University Of Washington And Harborview Medical Center Kali Therapeutics Kali Therapeutics [Member] Kali Therapeutics Schedule of Acquisition of Intangible Assets, Property, Plant and Equipment and Investments Accounted for Using the Equity Method by Segment Disclosure Of Acquisitions Of Property Plant And Equipment And Other Intangible Assets And Carrying Amount Of Investments In Associates And Joint Ventures By Operating Segment [Table Text Block] The disclosure of acquisitions of property plant and equipment and other intangible assets and carrying amount of investments in associates and joint ventures by operating segment. Net sales Revenue from sale of goods Value on redemption Redemption Of Debt Instrument Issued Redemption of debt instrument issued. Other profit or loss items with no cash effect on cash flows generated by operating activities Other adjustments to reconcile profit (loss) Meningitis, travel and endemics vaccines Meningitis, Travel And Endemics Vaccines [Member] Meningitis, Travel And Endemics Vaccines Plavix Plavix [Member] Plavix [Member] Legal And Arbitral Proceedings [Axis] Legal And Arbitral Proceedings [Axis] Legal And Arbitral Proceedings [Axis] 340B Drug Pricing Program in the US 340B Drug Pricing Program in the US [Member] 340B Drug Pricing Program in the US Acquisitions of property, plant and equipment and intangible assets Purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets Current provisions and other current liabilities Current Provisions And Other Current Liabilities The amount of current provisions and current other liabilities that the entity does not separately disclose in the same statement or note. to non-controlling interests Dividends paid to non-controlling interests, classified as financing activities Fair value per share awarded for three year service period (in euros per share) Fair Value Per Share Awarded For Three Year Service Period Fair value per share awarded to a three year service period. Disclosure Of Off Balance Sheet Commitments [Line Items] Disclosure Of Off-Balance Sheet Commitments [Line Items] [Line Items] for Disclosure Of Off Balance Sheet Commitments [Table] Statement of cash flows [abstract] Statement of cash flows [abstract] Sanofi Sanofi Euro Medium Term Notes [Member] Sanofi Euro Medium Term Notes Unwinding of discounting of provisions Expense arising from passage of time on other provisions Title and Position [Domain] Title and Position [Domain] Under 2025 plans Restricted Share Plan 2025 [Member] Restricted Share Plan 2025 [Member] Impairment losses on financial assets, net of reversals Impairment Losses On Financial Assets, Net Of Reversals Impairment Losses On Financial Assets, Net Of Reversals of which Chinese yuan renminbi Forward Currency Purchases In Chinese Yuan Renminbi [Member] Forward Currency Purchases In Chinese Yuan Renminbi Hedged items [Axis] Hedged items [axis] Total assets Assets, Related Party Transactions Assets, Related Party Transactions Summary of principal characteristics of restricted share plans Disclosure Of Employee Stock Ownership Plan Awarded In Capital Increase Reserved Explanatory [Table Text Block] Disclosure of employee stock ownership plan awarded in capital increase reserved explanatory [Text Block] pay capitalized Ester / receive 2.53% Interest Rate Swaps Pay Capitalized Ester / Receive 2.53% [Member] Interest Rate Swaps Pay Capitalized Ester / Receive 2.53% of which Brazilian real Forward Currency Sales In Brazilian Real [Member] Forward Currency Sales In Brazilian Real Value on redemption Value On Redemption [Member] Value on redemption. Investments accounted for using the equity method Investments accounted for using equity method Other countries Other Countries In Segment Results [Member] Other Countries In Segment Results Off-Balance Sheet Commitments [Abstract] Off-Balance Sheet Commitments Disclosure of transactions between related parties [line items] Disclosure of transactions between related parties [line items] Other comprehensive income: Other comprehensive income [abstract] Off balance sheet commitments Disclosure Of Off-Balance Sheet Commitments Explanatory [Text Block] Disclosure of off-balance sheet commitments. Tax effects Income tax relating to cash flow hedges included in other comprehensive income Decrease in actuarial assumption Percentage of reasonably possible decrease in actuarial assumption Instruments at fair value through other comprehensive income Non-current financial assets at fair value through other comprehensive income of which China CHINA of which United Arab Emirates dirham Forward Currency Purchases In United Emirates Dirham [Member] Forward Currency Purchases In United Emirates Dirham Argentina ARGENTINA Classes of contingent liabilities [domain] Classes of contingent liabilities [domain] CTTQ CTTQ [Member] CTTQ Technological platforms Technological Platforms [Member] Technological Platforms current Current Assets [Member] Current assets. Financial income Financial income Finance income Net Investment Hedge Net Investment Hedge [Member] Net Investment Hedge Acquisitions of consolidated undertakings and investments accounted for using the equity method Net cash flow on acquisition Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities Number of other manufacturers in legal proceeding Number Of Other Defendants In Legal Proceeding Number Of Other Defendants In Legal Proceeding Items not subsequently reclassifiable to profit or loss Items Not Subsequently Reclassifiable To Profit Or Loss [Member] Items not subsequently reclassifiable to profit or loss. Plan assets Plan assets [member] Lease liabilities Lease liabilities Stock option plan Stock Option Plan [member] Stock Option Plan [member] Provisions Beginning balance Ending balance Non-current provisions Impact of the workdown of acquired inventories remeasured at fair value Impact Of The Workdown Of Acquired Inventories Remeasured At Fair Value Impact of the workdown of acquired inventories remeasured at fair value arising from business combination in accordance with IFRS 3. Non-current liabilities related to business combinations and to non-controlling interests Non-current portion Non-Current Liabilities Related To Business Combinations And To Non-Controlling Interests This account includes non-current portion of contingent considerations that satisfy the recognition criteria of IFRS 3 Business combinations, measured initially at their fair value as at the date of acquisition. This account also includes non-current portion of liabilities related to non-controlling interests. Currency translation differences Increase (Decrease) Through Net Exchange Differences Business Combinations And Noncontrolling Interests Increase decrease through net exchange differences business combinations and noncontrolling interests. Minimum Minimum [Member] Net income from continuing operations Profit (loss) from continuing operations Transfers Increase (decrease) through transfers, intangible assets other than goodwill Hedges of net investments in foreign operations Change In Currency Translation On Hedges Of Net Investments In Foreign Operations Change in currency translation on hedges of net investments in foreign operations. Summary of Market Value of Net Debt Disclosure Of Market Value Of Net Debt [Table Text Block] Disclosure of market value of net debt [Text Block] Share capital Issued capital Rezurock Rezurock [Member] Rezurock Goodwill and other intangible assets Disclosure of intangible assets and goodwill [text block] Lovenox Lovenox [Member] Lovenox. Other gains and losses, and litigation Other losses and litigation Other Gains, (Losses) And Litigation The line item other gains and losses, and litigation includes the impact of material transactions of an unusual nature or amount. [note B.20.2.] Equity attributable to equity holders of OPAL JV Co Equity Attributable to Equity Holders, Related Party Transactions Equity Attributable to Equity Holders, Related Party Transactions Exercise of stock options Increase (decrease) through exercise of options, equity Forward currency sales In US dollar, expiring in 2026 and 2027 Forward Currency Sales In US Dollar Expiring In 2026 And 2027 [Member] Forward Currency Sales In US Dollar Expiring In 2026 And 2027 Commercial paper programs Commercial papers issued Products and services [axis] Products and services [axis] Increase/(decrease) in accounts payable Adjustments for increase (decrease) in trade accounts payable 5 year service period Five Year Service Period [Member] Five Year Service Period Income tax expense Total Tax expense (income) Increases in provisions and other liabilities Increase (Decrease) In Provisions And Other Liabilities Increase (Decrease) In Provisions And Other Liabilities Proportion of ownership interest disposed in subsidiary Proportion Of Ownership Interest Disposed In Subsidiary Proportion Of Ownership Interest Disposed In Subsidiary Depreciation, amortization and impairment of property, plant and equipment, right-of-use assets and intangible assets Adjustments For Depreciation And Amortisation Expense And Impairment Loss Reversal Of Impairment Loss Of Property Plant And Equipment Right-Of Use Assets And Intangible Asset Depreciation, amortization and impairment of property, plant and equipment, right-of use assets and intangible assets. Cash flows from (used in) operating activities [abstract] Cash flows from (used in) operating activities [abstract] Share of profit/(loss) from investments accounted for using the equity method Share of profit (loss) of associates and joint ventures accounted for using equity method Beginning balance Ending balance Fair value of contingent consideration payable Contingent liabilities recognised in business combination Types Of Vesting Conditions Axis [Domain] Types Of Vesting Conditions Axis [Domain] Types Of Vesting Conditions Axis [Domain] Selling and general expenses Selling and general expenses Selling, general and administrative expense Document Period End Date Document Period End Date Cross currency swap, expiring 2032 Cross Currency Swap, Expiring 2032 [Member] Cross Currency Swap, Expiring 2032 [Member] Disclosure of classes of share capital [Line Items] Disclosure of classes of share capital [line items] 3 year service period Three Year Service Period [Member] Three Year Service Period Maturity [Axis] Maturity [axis] Tax effects Income tax relating to components of other comprehensive income that will be reclassified to profit or loss Number of largest customers Number Of Largest Customers Number Of Largest Customers United Kingdom UNITED KINGDOM Adjustment for restricted shares (in shares) Dilutive Effect Of Share Options On Number Of Restricted Shares Dilutive effect of share options on number of restricted shares. Currency and interest rate derivatives Currency And Interest Rate Derivatives Used To Manage Debt Net Of Cash And Cash Equivalents Currency and interest rate derivatives used to manage debt, net of cash and cash equivalents. Goodwill Goodwill Disposal Group [Axis] Disposal Group [Axis] Disposal Group Associates [Axis] Associates [axis] Total Reportable segments [member] Reportable segments [member] Document Type Document Type Classes of financial assets [Axis] Classes of financial assets [axis] Cross currency swap Cross Currency Swap [Member] Cross Currency Swap [Member] Other assets Other Assets, Related Party Transactions Other Assets, Related Party Transactions Currency translation differences Increase (decrease) through net exchange differences, intangible assets other than goodwill Items subsequently reclassifiable to profit or loss Items Subsequently Reclassifiable To Profit Or Loss [Member] Items subsequently reclassifiable to profit or loss. Statistical Measurement [Axis] Statistical Measurement [Axis] Share repurchase program, authorized, amount Share Repurchase Program, Authorized, Amount Classes of assets [Axis] Classes of assets [axis] Operating segments Operating segments [member] 2030 and beyond Later than four years and not later than five years [member] Stock options and other share-based payment [Member] Types of share-based payment arrangements [domain] Revenue of acquiree since acquisition date Revenue of acquiree since acquisition date Disclosure of reconciliation of changes in goodwill [table] Disclosure of reconciliation of changes in goodwill [table] of which France FRANCE Equity attributable to equity holders of Sanofi Equity attributable to owners of parent Interest rate and currency derivatives used to manage cash and cash equivalents Interest Rate And Currency Derivatives Used To Manage Cash And Cash Equivalent Interest rate and currency derivatives used to manage cash and cash equivalent. Range [Axis] Range [axis] Components of equity [axis] Components of equity [axis] Fixed rate bond issue from March 2018 Fixed Rate Bond Issue from March 2018 [Member] Fixed Rate Bond Issue from March 2018 Net cash provided by/(used in) financing activities of the discontinued Opella business Cash flows from (used in) financing activities, discontinued operations Entity Information [Line Items] Entity Information [Line Items] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Disclosure of Information about Credit Exposures Designated as Measured at Fair Value Through Profit or Loss [Table] Disclosure of information about credit exposures designated as measured at fair value through profit or loss [table] Disposals of consolidated undertakings and investments accounted for using the equity method, net of tax Cash flows from losing control of subsidiaries or other businesses, classified as investing activities Reclassified items [Member] Reclassified items [domain] CTTQ Rovidicitinib license agreement CTTQ Rovidicitinib License Agreement [Member] CTTQ Rovidicitinib License Agreement Consolidated shareholders' equity Disclosure of share capital, reserves and other equity interest [text block] Dupixent product litigation in the US Dupixent Product Litigation In The US [Member] Dupixent Product Litigation In The US Forward currency sales in BRL, expiring in 2027 Forward Currency Sales In Brazilian Real Expiring In 2027 [Member] Forward Currency Sales In Brazilian Real Expiring In 2027 OPAL JV Co OPAL JV Co [Member] OPAL JV Co Categories of related parties [domain] Categories of related parties [domain] Other current assets Other current assets Impairment losses, net of reversals Impairment loss recognised in other comprehensive income, intangible assets other than goodwill Disclosure of detailed information about business combination [table] Disclosure of detailed information about business combination [table] Disclosure of Information About Major Customers and Credit Risk [Table] Disclosure Of Information About Major Customers And Credit Risk [Table] Disclosure of information about major customers and credit risk. Interest received Interest received, classified as operating activities Reduction in share capital Reduction of issued capital Cash and cash equivalents at beginning of period Cash and cash equivalents, end of period Cash and cash equivalents if different from statement of financial position Products and services [domain] Products and services [domain] Schedule of Segment Results Disclosure of operating segments [text block] Average number of shares outstanding (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Long-term prepaid expenses Long Term Prepaid Expenses Long term prepaid expenses. Trading equity securities Trading equity securities [member] Other operating income and expenses Miscellaneous Other Operating Income (Expenses) Other operating income and expenses. Stock price (in euro per share) Stock Price Stock Price Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] pay capitalized Ester / receive 2.71% Interest Rate Swaps Pay Capitalized Ester / Receive 2.71% [Member] Interest Rate Swaps Pay Capitalized Ester / Receive 2.71% Total debt Market value Borrowings Changes in scope of consolidation Change In Scope Of Consolidation Through Business Combination, Intangible Assets Other Than Goodwill Change In Scope Of Consolidation Through Business Combination, Intangible Assets Other Than Goodwill Number of bonds redeemed Number Of Bond Redeemed Number Of Bond Redeemed Other borrowings Other borrowings Defined benefit plans [Member] Defined benefit plans [domain] Number of options, exercisable (in shares) Number of share options exercisable in share-based payment arrangement Other liabilities Other Liabilities, Related Party Transactions Other Liabilities, Related Party Transactions Net change in cash and cash equivalents Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Current liabilities related to business combinations and to non-controlling interests Current portion Current Liabilities Related To Business Combinations And To Non-Controlling Interests This account includes current portion of contingent considerations that satisfy the recognition criteria of IFRS 3 Business combinations, measured initially at their fair value as at the date of acquisition. This account also includes current portion of liabilities related to non-controlling interests. Customers [Member] Major customers [domain] pay capitalized SOFR USD/ receive 1.03% Interest Rate Swaps Pay Capitalized USD SOFR / Receive 1.03% [Member] Interest Rate Swaps Pay Capitalized USD SOFR / Receive 1.03% Net cash provided by/(used in) financing activities Cash flows from (used in) financing activities Four billion facility maturing April 2026 Four Billion Facility Maturing April 2026 [Member] Four Billion Facility Maturing April 2026 Counterparties [Axis] Counterparties [axis] Fair value hedges Fair value hedges [member] Accumulated amortization and impairment Accumulated depreciation, amortisation and impairment [member] Fair value per share awarded for five year service period (in euros per share) Fair Value Per Share Awarded For Five Year Service Period Fair Value Per Share Awarded For Five Year Service Period Statement of changes in equity [table] Statement of changes in equity [table] Actuarial assumptions [axis] Actuarial assumptions [axis] Total liabilities Liabilities, Related Party Transactions Liabilities, Related Party Transactions Long-term loans and advances and other non-current receivables Non current loans and receivables Non current loans and receivables Cost of sales Cost of sales Cost of sales Short-term debt and current portion of long-term debt Current borrowings and current portion of non-current borrowings Disclosure of reconciliation of carrying amount to value on redemption [Table] Disclosure Of Reconciliation Of Carrying Amount To Value On Redemption [Table] Disclosure of reconciliation of carrying amount to value on redemption [table] Assets [Member] Classes of assets [domain] Current Fiscal Year End Date Current Fiscal Year End Date Total equity and liabilities Equity and Liabilities, Related Party Transactions Equity and Liabilities, Related Party Transactions Current assets Current assets, Related Party Transactions Current assets, Related Party Transactions Employee share ownership plan Increase (Decrease) Through Share-Based Payment Plans Employee Share Ownership Plans Employee share ownership plans. Hedges [Member] Types of hedges [domain] Amvuttra licensing income Income Resulting From Out-Licensing Income Resulting From Out-Licensing Short-term debt Short-term debt Borrowings recognised as of acquisition date Dividend paid per share (in euros per share) Dividends paid, ordinary shares per share Income before tax and investments accounted for using the equity method Income before tax and investments accounted for using the equity method Income Before Tax And Investments Accounted For Equity Method Investments Income before tax and investments accounted for equity method investments. Share Repurchase 2025 Program Share Repurchase 2025 Program [Member] Share Repurchase 2025 Program [Member] General Information About Financial Statements [Abstract] General Information About Financial Statements [Abstract] General Information About Financial Statements [Abstract] Bottom of range Bottom of range [member] Proportion of ownership interest in joint venture Proportion of ownership interest in joint venture Categories of related parties [axis] Categories of related parties [axis] Disclosure of detailed information about borrowings [Line Items] Disclosure of detailed information about borrowings [line items] Comprehensive income Comprehensive Income, Related Party Disclosures Comprehensive Income, Related Party Disclosures Change in cost of sales, on a reported basis (IFRS), percentage Increase (Decrease) In Cost Of Sales, On A Reported Basis (IFRS), Percentage Increase (Decrease) In Cost Of Sales, On A Reported Basis (IFRS), Percentage Net income Net income for the period Profit (loss) Non-current assets Non Current assets, Related Party Transactions Non Current assets, Related Party Transactions Change in fair value (investments accounted for using the equity method, net of taxes) Change In Fair Value On Cash Flow Hedges Net Of Tax On Associates And Joint Ventures Change in fair value on cash flow hedges net of tax on associates and joint ventures. Non-current liabilities Non-current liabilities Number of shares (in shares) Number of shares issued Summary of Investments in Associates and Joint Ventures Disclosure Of Investments In Associates And Joint Ventures [Table Text Block] The entire disclosure of investments in associates and joint ventures explanatory. Segment information Disclosure of entity's operating segments [text block] Dynavax Dynavax [Member] Dynavax Reserves and retained earnings Retained earnings [member] Bank credit balances Bank overdrafts Net sales and other revenues Net Sales and Other Revenues, Related Party Disclosures Net Sales and Other Revenues, Related Party Disclosures Financial expenses and income Disclosure of finance income (cost) [text block] 2027 Later than one year and not later than two years [member] Present value of defined benefit obligation Present value of defined benefit obligation [member] Dividend paid out of earnings Dividends recognised as distributions to owners of parent Analysis of income and expense [abstract] Analysis of income and expense [abstract] Summary of options outstanding and exercisable Disclosure Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table Text Block] The disclosure of share based compensation shares authorized under stock option plans by exercise price range. Other current and non-current assets and liabilities Other Current Assets And Non-Current Assets And Liabilities As Of Acquisition Date Other assets and non-current assets and liabilities as of acquisition date. Difference between the standard French tax rate and the rates applicable to Sanofi Tax rate effect of foreign tax rates Summary of Movements in Non-Current Provisions Disclosure Of Non-Current Provisions [Table Text Block] Disclosure of noncurrent provisions explanatory. Bond issues Bonds issued Summary of gross value of overdue receivables Disclosure Of Overdue Receivables Gross Value [Table Text Block] The disclosure of overdue receivables gross value. Expense arising from the impact of acquisitions on inventories Expense Arising From The Impact Of Acquisitions On Inventories Expenses arising from the impact of acquisitions on inventories. Carrying amount [Member] Carrying amount [member] Net cash provided by/(used in) continuing financing activities Cash flows from (used in) financing activities, continuing operations Capital increase by exercise of stock subscription options (in shares) Number Of Shares Issued In Regards Of Capital Increase By Exercise Of Stock Subscription Options Number of shares issued in regards of capital increase by exercise of stock subscription options. Payments made Settled liabilities, contingent liabilities recognised in business combination Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] Additional long-term debt contracted Proceeds from non-current borrowings Seasonal trends Seasonality Or Cyclicality Of Interim Operations [Policy Text Block] Seasonality Or Cyclicality Of Interim Operations Cancellation of treasury shares Cancellation of treasury shares Other Miscellaneous other revenue Miscellaneous other revenue Right-of-use assets Right-of-use assets Share repurchase program Purchase of treasury shares CVRs issued in connection with the acquisition of Blueprint CVRs issued in connection with the acquisition of Blueprint [Member] CVRs issued in connection with the acquisition of Blueprint Number of operating segments Number Of Operating Segments Number of operating segments. Disposal Group [Domain] Disposal Group [Domain] Disposal Group [Domain] Amvuttra Amvuttra [Member] Amvuttra Summary of Geographical Information on Net Sales and Non-Current Assets Disclosure of geographical areas [text block] Statistical Measurement [Domain] Statistical Measurement [Domain] Sanofi Sanofi [member] Sanofi. Schedule of Other Operating Expenses Other Operating Expenses [Table Text Block] Other Operating Expenses [Table Text Block] Others Other Restructuring Costs Other restructuring costs. of which Turkish lira Forward Currency Purchases In Turkish lira [Member] Forward Currency Purchases In Turkish lira Turkey TÜRKIYE Provisions for pensions & other post-employment benefits Provisions For Pensions And Other Postemployment Benefits [member] Provisions for pensions and other post-employment benefits. of which US dollar Forward Currency Sales In US Dollar [Member] Forward currency sales in USD. Service period Number Of Years, Service Period Number Of Years, Service Period Equity interests of acquirer (in USD per share) Business Combination, Equity Interests Of Acquirer, Per Share Business Combination, Equity Interests Of Acquirer, Per Share Equity instruments included in financial assets and financial liabilities: Equity Instruments Included In Financial Assets [Member] Equity Instruments Included In Financial Assets[member] Number of shares not yet fully vested (in shares) Number Of Restricted Shares Not Yet Fully Vested Number of restricted shares not yet fully vested. Weighted average amortization period Useful life measured as period of time, intangible assets other than goodwill Tax effects of share-based payments Decrease (increase) through tax on share-based payment transactions, equity Share of profit/(loss) from investments accounted for using the equity method Share of profit (loss) of associates accounted for using equity method Disclosure of information about major customers and credit risk [line items] Disclosure Of Information About Major Customers And Credit Risk [Line Items] Disclosure of information about major customers and credit risk. Equity value of acquirer Business Combination, Equity Value Of Acquirer Business Combination, Equity Value Of Acquirer Value of hedge recognized in equity Value Of Hedge Recognized In Equity [Member] Value Of Hedge Recognized In Equity [Member] Total equity Beginning balance Ending balance Equity Share repurchase program, amount paid Share Repurchase Program, Amount Paid Share Repurchase Program, Amount Paid Property, plant and equipment owned Property, plant and equipment Property, plant and equipment Net cash provided by/(used in) operating activities of the discontinued Opella business Cash flows from (used in) operating activities, discontinued operations Gross profit Gross profit of which Saudi Arabian riyal Forward Currency Sales In Saudi Arabian Riyal [Member] Forward Currency Sales In Saudi Arabian Riyal Currency translation differences on foreign subsidiaries (excluding investments accounted for using the equity method) Change In Currency Translation Before Tax Excluding Associates And Joint Ventures Change in currency translation before tax excluding associates and joint ventures. Impairment of intangible assets Disclosure Of Impairment Of Intangible Assets And Property Plant And Equipment Explanatory [Text Block] The entire disclosure for impairment of intangible assets and property, plant and equipment. Forward currency purchases Forward Currency Purchases [Member] Forward currency purchases. Corporate Information And Statement Of IFRS Compliance [Abstract] Corporate information and statement of IFRS compliance [abstract] Disclosure of detailed information about property, plant and equipment [line items] Disclosure of detailed information about property, plant and equipment [line items] From €80.00 to €90.00 per share Exercise Price Range Four [Member] Exercise Price Range Four [Member] Change in fair value of equity instruments included in financial assets and financial liabilities Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, entity's own equity instruments Sales Revenue from sale of goods, related party transactions Change in business operating income, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Business Operating Income, At Constant Exchange Rates Non-IFRS, Percentage Increase (Decrease) In Business Operating Income, At Constant Exchange Rates Non-IFRS, Percentage Weighted average exercise price per share, outstanding (in euros per share) Weighted average exercise price of share options outstanding in share-based payment arrangement Marketed products Marketed Products [Member] Marketed products. Net income attributable to equity holders of Sanofi Attributable to equity holders of Sanofi Profit (loss), attributable to owners of parent Other comprehensive income/(loss) for the period from discontinued operations, net of taxes (C) Other comprehensive income from discontinued operations Other comprehensive income from discontinued operations COVID-19 and Influenza vaccines COVID-19 And Influenza Vaccines [Member] COVID-19 And Influenza Vaccines Adjustment to debt measured at fair value Adjustment To Debt Measured At Fair Value [Member] Adjustment to debt measured at fair value. Lantus Lantus [Member] Lantus. Basic earnings per share (in euros per share) Basic Earnings (Loss) Per Share, Attributable To Owners Of Parent Basic Earnings (Loss) Per Share, Attributable To Owners Of Parent Restructuring costs and similar items Disclosure Of Restructuring Costs And Similar Items [Text Block] The entire disclosure of restructuring costs and similar items. Change in other revenue, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Other Revenue, At Constant Exchange Rates Non-IFRS, Percentage Increase (Decrease) In Other Revenue, At Constant Exchange Rates Non-IFRS, Percentage Transfers Increase (decrease) through transfers and other changes, other provisions Major customers [Axis] Major customers [axis] Under 2024 plans Restricted Share Plan 2024 [Member] Restricted Share Plan 2024 Current liabilities Current liabilities Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated Disclosure Of Financial Currency Hedging Instruments With Notional Amount Translated In To Euros At Closing Exchange Rate Explanatory [Table Text Block] The disclosure of financial currency hedging instruments with notional amount translated in to euros at closing exchange rate. Dividends paid: Dividends Paid [Abstract] Dividends Paid Cash flow hedges Cash flow hedges [member] Trade and other receivables [abstract] Acquired R&D Acquired Research And Development [Member] Acquired Research And Development Inventories Current inventories Deferred tax assets Deferred tax assets Attributable to non-controlling interests Non-controlling interests [member] Attributable to non-controlling interests Comprehensive income, attributable to non-controlling interests Weighted average residual life (years) Weighted average remaining contractual life of outstanding share options Percentage of entity's revenue Percentage of entity's revenue Additional paid-in capital Additional paid-in capital [member] Statement of changes in equity [abstract] Statement of changes in equity [abstract] Aggregated measurement [Member] Measurement [domain] Disclosure of detailed information about business combination Disclosure of detailed information about business combination [text block] Principal Alliances [Axis] Principal Alliances [Axis] Principal Alliances Actuarial gains/(losses) Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Actuarial assumption of expected rates of inflation Actuarial assumption of expected rates of inflation [member] Net change in short-term debt and other financial instruments Cash Flows From (Used In) Increase (Decrease) In Current Borrowings And Other Financial Instruments Cash Flows From (Used In) Increase (Decrease) In Current Borrowings And Other Financial Instruments Disclosure Of Detailed Information About Finance Income Expense [table] Disclosure Of Detailed Information About Finance Income Expense [table] Schedule disclosing information related to details of finance income (expense). Total number of shares awarded (in shares) Number of other equity instruments granted in share-based payment arrangement Gain on derivatives used to manage cash and cash equivalents Gain (Loss) On Derivatives Used To Manage Cash And Cash Equivalents Gain (loss) on derivatives used to manage cash and cash equivalents. Legal Entity [Axis] Legal Entity [Axis] Customer two Customer Two [member] Customer two. BPIFrance BPIFrance [Member] BPIFrance Subsidiaries [axis] Subsidiaries [axis] Net income attributable to equity holders of Sanofi Profit (loss), attributable to ordinary equity holders of parent entity, used in calculating basic earnings per share Gain on disposal of Opella before tax Gain on Disposal of Opella, Disposal Group Including Discontinued Operations Gain on Disposal of Opella, Disposal Group Including Discontinued Operations Interest paid Interest paid, classified as operating activities Actuarial assumption of discount rates Actuarial assumption of discount rates [member] Geographical [Domain] Geographical [Domain] Equity risk hedging instruments designated as fair value hedges Equity Risk Hedging Instruments Designated At Fair Value Hedges Equity Risk Hedging Instruments Designated At Fair Value Hedges With market condition With Market Condition [Member] With Market Condition Diluted earnings per share (in euros per share) Diluted Earnings (Loss) Per Share, Attributable To Owners Of Parent Diluted Earnings (Loss) Per Share, Attributable To Owners Of Parent Disclosure of Financial Assets that are Either Past Due or Impaired [Table] Disclosure of financial assets that are either past due or impaired [table] Geographical areas [Axis] Geographical areas [axis] Net defined benefit liability (asset) [Member] Net defined benefit liability (asset) [domain] Summary of Changes in Financial Position Disclosure Of Changes In Financial Position [Table Text Block] Disclosure of changes in financial position [text block] Term of option to extend lease Extension, Term Extension, Term Royalties and other income Royalties And Other Income, Related Party Transactions Royalties and other income, related party transactions. % of share capital for the period Percentage Of Share Capital For The Period Percentage of share capital for the period. Non-current lease liabilities Non-current lease liabilities Net change in non-current provisions and other non-current liabilities Adjustments For Non-Current Provisions And Other Non-Current Liabilities Adjustments for noncurrent provisions and other noncurrent liabilities. Other intangible assets Carrying amount of intangible assets Intangible assets other than goodwill at beginning of period Intangible assets other than goodwill at end of period Intangible assets other than goodwill Disclosure of initial application of standards or interpretations [line items] Disclosure of initial application of standards or interpretations [line items] Other comprehensive income Accumulated other comprehensive income Accumulated other comprehensive income [member] Segments [Member] Segments [domain] Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents Summary of Principal Transactions and Balances with Related Parties Disclosure of transactions between related parties [text block] Total equity and liabilities Equity and liabilities United States United States UNITED STATES Currency translation differences Increase (decrease) through net exchange differences, other provisions Property, plant and equipment [abstract] Property, plant and equipment [abstract] Business Combinations [Axis] Business combinations [axis] Forward currency purchases in US dollar, US bond Forward Currency Purchases In US Dollar, US Bond [Member] Forward Currency Purchases In US Dollar, US Bond Entity's total for business combinations [Member] Business combinations [domain] non-current Non-Current Liabilities [Member] Non-current liabilities. CVRs issued in connection with the acquisition of Vigil CVRs issued in connection with the acquisition of Vigil [Member] CVRs issued in connection with the acquisition of Vigil current Current Liabilities [Member] Current liabilities. Number of restricted shares vested (in shares) Number Of Restricted Shares Vested In Regards Of Capital Increase Number Of Restricted Shares Vested In Regards Of Capital Increase Derecognized receivables Derecognized Receivables Derecognized receivables. Summary of number of restricted shares not yet fully vested Disclosure Of Number Of Restricted Share Plans Not Yet Fully Vested [Table Text Block] Disclosure of number of restricted share plans Not yet fully vested. Number of product liability cases Number Of Product Liability Cases Number Of Product Liability Cases Change in revenue, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Revenue, At Constant Exchange Rates Non-IFRS, Percentage Increase (Decrease) In Revenue, At Constant Exchange Rates Non-IFRS, Percentage Summary of movements within other comprehensive income Disclosure Of Accumulated Other Comprehensive Income Explanatory [Table Text Block] Disclosure of detailed information of accumulated other comprehensive income. Disclosure of attribution of expenses by nature to their function [table] Disclosure of attribution of expenses by nature to their function [table] Joint ventures [domain] Joint ventures [domain] Net cash provided by/(used in) continuing investing activities Net Cash Provided by/(used in) Continuing Investing Activities Net Cash Provided by/(used in) Continuing Investing Activities Principal Alliances [Domain] Principal Alliances [Domain] Principal Alliances [Domain] Commercial paper program in France Commercial Paper Program In France [Member] Commercial paper program In France. Fair value of plan at the date of grant Fair Value Of Plan At Date Of Grant Fair value of plan at the date of grant. Disclosure of net defined benefit liability (asset) [Table] Disclosure of net defined benefit liability (asset) [table] Customer three Customer Three [member] Customer three. Disclosure of Financial Assets that are Either Past Due or Impaired [Line Items] Disclosure of financial assets that are either past due or impaired [line items] Total Later than five years [member] Financial assets, class [Member] Classes of financial assets [domain] Summary of other non-current assets Disclosure Of Components Of Other Non-Current Assets [Table Text Block] The disclosure of components of other noncurrent assets. International financial reporting standards (IFRS) Statement of IFRS compliance [text block] Certain wholesalers in the United States Certain Wholesalers, In The United States [Member] Certain Wholesalers, In The United States Total equity Equity, Related Party Transactions Equity, Related Party Transactions Net interest expense on lease liabilities Interest expense on lease liabilities Use of estimates and judgments Disclosure of accounting judgements and estimates [text block] Repayments of long-term debt Repayments of non-current borrowings Goodwill Goodwill recognised as of acquisition date Net cash provided by/(used in) investing activities of the discontinued Opella business Net Cash Provided by/(used in) Discontinuing Investing Activities Net Cash Provided by/(used in) Discontinuing Investing Activities Provisions for other long-term benefits Provisions For Other Long Term Benefits [member] Provisions for other long term benefits. Commercialization related expenses Commercialization Related Expenses [Member] Commercialization related expenses. Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] Under 2023 plans Restricted Share Plan 2023 [Member] Restricted Share Plan 2023 Non-current provisions and other non-current liabilities Non-current provisions Non-Current Provisions And Other Non-Current Liabilities The amount of non-current provisions and non-current other liabilities that the entity does not separately disclose in the same statement or note. Number of tranches Number Of Tranches Number Of Tranches Subordinate hybrid bond, related party transactions Subordinate Hybrid Bond, Related Party Transactions Subordinate Hybrid Bond, Related Party Transactions Entity's total for segment consolidation items [Member] Segment consolidation items [domain] Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [line items] Loans to Associates Loans to Associates Loans to Associates Types Of Vesting Conditions Axis [Axis] Types Of Vesting Conditions Axis [Axis] Types Of Vesting Conditions Axis Change in research and development expenses, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Research And Development Expenses, At Constant Exchange Rates Non-IFRS, Percentage Increase (Decrease) In Research And Development Expenses, At Constant Exchange Rates Non-IFRS, Percentage Mosaic Health in the US Mosaic Health in the US [Member] Mosaic Health in the US Number of shares repurchased (in shares) Number Of Shares Repurchased Number of shares repurchased. Debt instruments included in financial assets: Debt Instruments [Member] Debt Instruments. Associates and joint ventures Associates And Joint Ventures [Member] Associates and Joint Ventures. Net cash provided by/(used in) operating activities Cash flows from (used in) operating activities Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Current tax expense (income), related to Pillar Two income taxes Current tax expense (income), related to Pillar Two income taxes Significant information for the first half of 2026 Disclosure Of Impact Of Changes In The Scope Of Consolidation Due To Acquisitions And Divestments Explanatory [Text Block] The entire disclosure for impact of changes in the scope of consolidation due to acquisitions and divestments. Restructuring provisions Non-Current Restructuring Provision [Member] Restructuring provisions. Summary of Operating Currency Hedging Instruments Disclosure Of Operating Currency Hedging Instruments With Notional Amount Translated In To Euros At Closing Exchange Rate [Table Text Block] The disclosure of operating currency hedging instruments with notional amount translated in to euros at closing exchange rate. Information related to Opella, presented within discontinued operations Disclosure of non-current assets held for sale and discontinued operations [text block] Entity [Domain] Entity [Domain] Other operating income Other Miscellaneous other operating income Document Fiscal Year Focus Document Fiscal Year Focus Overdue by > 12 months Later than one year [member] Four billion facility maturing on March, 2030 Four Billion Facility Maturing On March, 2030 [Member] Four Billion Facility Maturing December 2027 [Member] Disclosure of Measurement Principles Applied to Financial Instruments Disclosure of detailed information about financial instruments [text block] Polio/pertussis/Hib primary vaccines and boosters, incl. Heplisav-B Polio Pertussis Hib Primary Vaccines And Boosters, incl. Heplisav-B [Member] Polio Pertussis Hib Primary Vaccines And Boosters, incl. Heplisav-B Current liabilities Current Liabilities, Related Party Transactions Current Liabilities, Related Party Transactions Classes of other provisions [Axis] Classes of other provisions [axis] Infraserv GmbH & Co. Höchst KG Infraserv Gmbh And Co Hochst KG [member] Infraserv GmbH and Co. Hochst KG. New pronouncements issued by the IASB and applicable from 2027 Disclosure of expected impact of initial application of new standards or interpretations [text block] Material reconciling items Material reconciling items [member] Accounts payable Current trade payables non-current Non-Current Assets [Member] Non-current assets. Total other operating expenses Other Operating Expense Other Operating Expense Sarclisa Sarclisa [Member] Sarclisa Disclosure of initial application of standards or interpretations [table] Disclosure of initial application of standards or interpretations [table] Derivative financial liabilities Derivative financial liabilities Restricted shares Restricted Shares [Member] Restricted shares. Overdue by 3-6 months Later than three months and not later than six months [member] Accounts receivable Current trade receivables Adjustment for stock options with dilutive effect (in shares) Dilutive effect of share options on weighted average number of ordinary shares Allowances Allowance for credit losses [member] Liabilities related to assets held for sale Liabilities included in disposal groups classified as held for sale Summary of earnings per share Disclosure of earnings per share [text block] Gross value Gross carrying amount [member] Standard tax rate applicable in France Applicable tax rate Disclosure of Information about Credit Exposures Designated as Measured at Fair Value Through Profit or Loss [Line Items] Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] Net cash inflow/(outflow) from the Opella transaction Net Cash Inflow from Discontinued Operations Net Cash Inflow from Discontinued Operations Issuance of Sanofi shares Proceeds from issuing shares Europe Europe [Member] 2026 Not later than one year [member] Firm orders of property, plant and equipment Firm Orders Of Property Plant And Equipment Firm orders of property plant and equipment. Disclosure of Accounts Receivable [Table] Disclosure Of Accounts Receivable [Table] Disclosure of Accounts receivable Table. Other intangible assets Identifiable intangible assets recognised as of acquisition date Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Summary of Difference Between Effective Tax Rate and Standard Corporate Income Tax Rate Disclosure Of Reconciliation Of Average Effective Tax Rate And Applicable Tax Rate Explanatory [Table Text Block] Disclosure of reconciliation of average effective tax rate and applicable tax rate. Actuarial gains/(losses) of investments accounted for using the equity method, net of taxes Actuarial Gains (Losses) Arising From Changes In Financial Assumptions Net Defined Benefit Liability Asset Net Of Tax On Associates And Joint Ventures Actuarial gains (losses) arising from changes in financial assumptions net defined benefit liability asset net of tax on associates and joint ventures. Long-term debt Non-current portion of non-current borrowings (Increase)/decrease in inventories Adjustments for decrease (increase) in inventories Purchase price Consideration transferred, acquisition-date fair value Repayment of lease liabilities Payments of lease liabilities, classified as financing activities Share of undistributed earnings from investments accounted for using the equity method Adjustments for undistributed profits of investments accounted for using equity method Non-operating foreign exchange gains/(losses) Non-Operating Foreign Exchange Gains/(Losses) Non-operating foreign exchange gains/(losses). Summary of acquisitions and capitalized interest by operating segment Disclosure Of Acquisitions Of Property Plant And Equipment By Operating Segments Explanatory [Table Text Block] Disclosure of acquisitions of property plant and equipment by operating segments explanatory [text block] Proportion of ownership interest in subsidiary Proportion of ownership interest in subsidiary Disclosure of impairment loss and reversal of impairment loss [abstract] Change in fair value (excluding investments accounted for using the equity method) Change In Fair Value On Cash Flow Hedges Excluding Associates And Joint Ventures Change in fair value on cash flow hedges excluding associates and joint ventures. Entity Registrant Name Entity Registrant Name Basic earnings per share (in euros per share) Basic earnings (loss) per share Measurement [Axis] Measurement [axis] Payment of dividends to non-controlling interests Dividends recognised as distributions to non-controlling interests Three billion eight hundred fifty million facility maturing April 2031 Three Billion Eight Hundred Fifty Million Facility Maturing April 2031 [Member] Three Billion Eight Hundred Fifty Million Facility Maturing April 2031 Change in fair value (excluding investments accounted for using the equity method) Change In Fair Value On Debt Instrument Excluding Associates And Joint Ventures Change In Fair Value On Debt Instrument Excluding Associates And Joint Ventures Fixed rate bond maturing march 2029 Fixed Rate Bond Maturing March 2029 [Member] Fixed Rate Bond Maturing March 2029 Average number of shares used to compute diluted earnings per share (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items] Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] Classes of intangible assets other than goodwill [domain] Classes of intangible assets other than goodwill [domain] Amortization of intangible assets of acquiree since acquisition date Amortization of Intangible Assets of Acquiree Since Acquisition Date Amortization of Intangible Assets of Acquiree Since Acquisition Date Cost of employee benefits (stock options and other share-based payments) Adjustments for share-based payments Share-based payment plans: Share Based Payment Plans [abstract] Share based payment plans. Currency translation differences (investments accounted for using the equity method) Change In Currency Translation Net Of Tax On Associates And Joint Ventures Change in currency translation net of tax on associates and joint ventures. Net sales and other revenues Revenue From Disposal Group Including Discontinued Operations Revenue From Disposal Group Including Discontinued Operations Cross currency seller swaps Cross Currency Seller Swaps [Member] Cross Currency Seller Swaps [Member] Schedule of movements in other intangible assets Disclosure Of Reconciliation Of Changes In Other Intangible Assets [Table Text Block] Disclosure of reconciliation of changes in other intangible assets. Summary of Net Debt by Type Valuation of Redemption Disclosure Of Debt Net Of Cash And Cash Equivalents By Type At Value On Redemption Explanatory [Table Text Block] The disclosure of debt net of cash and cash equivalents by type at value on redemption. Number of shares issued immediately for employer's contribution (in shares) Issuance Of Further Shares As An Employers Contribution Further shares as an employers contribution. 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Subscription price (in euros per share) Subscription Price Per Share Subscription price per share. Change in cost of sales, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Cost Of sales At Constant Exchange Rates, Percentage Non-IFRS) Increase (Decrease) In Cost Of sales At Constant Exchange Rates Non-IFRS), Percentage Hedging Instruments [Axis] Hedging instruments [axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Ranges of exercise prices for outstanding share options [domain] Ranges of exercise prices for outstanding share options [domain] Acquisitions and other increases Additions other than through business combinations, intangible assets other than goodwill Interest rate and currency derivatives used to manage debt Interest Rate And Currency Derivatives Used To Manage Debt Interest rate and currency derivatives used to manage debt. Pre-funded pension obligations Pre-Funded Pension Obligations Pre-funded pension obligations. ALTUVIIIO Altuviiio [Member] Altuviiio Types Of Agreement [Domain] Types Of Agreement [Domain] Types Of Agreement [Domain] Disclosure of Accounts Receivable [Line Items] Disclosure Of Accounts Receivable [line items] Disclosure Of Accounts Receivable [line items] Customer one Customer One [member] Customer one. Number of syndicated credit facilities Number Of Syndicated Credit Facilities Number Of Syndicated Credit Facilities Disclosure of contingent liabilities in business combination [abstract] Products, trademarks and other rights Products, Trademarks And Other Rights [Member] Products, trademarks and other rights Summary of Restructuring Costs and Similar Items Disclosure Of Restructuring Costs Details [Table Text Block] The disclosure of restructuring costs details. 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Loss of acquiree since acquisition date Profit (loss) of acquiree since acquisition date Other Other tax rate effects for reconciliation between accounting profit and tax expense (income) Disclosure Of Noncurrent Provisions [Table] Disclosure Of Non-Current Provisions [Table] Disclosure Of Noncurrent Provisions [Table] Disclosure Of Other Non-current Assets [Table] Disclosure Of Other Non-Current Assets [Table] Schedule disclosing information related to other non-current assets. Upfront license payment Upfront License Payment Upfront License Payment Operating currency hedging instruments in place Derivative Financial Instruments Derivative financial instrument Antibodies Collaboration Agreement Antibodies Collaboration Agreement [Member] Antibodies Collaboration Agreement Number of restricted shares alloted in regards of capital increase (in shares) Number Of Restricted Shares Alloted In Regards Of Capital Increase Number Of Restricted Shares Alloted In Regards Of Capital Increase Disclosure of net defined benefit liability (asset) [Line Items] Disclosure of net defined benefit liability (asset) [line items] Percentage of Sanofi's share capital acquired Percentage Of Sanofi's Share Capital Acquired Percentage Of Sanofi's Share Capital Acquired Non-current liabilities Non Current Liabilities, Related Party Transactions Non Current Liabilities, Related Party Transactions Current income tax liabilities Current tax liabilities, current Title and Position [Axis] Title and Position [Axis] Financial currency hedging instruments in place Derivative Financial Instruments To Manage Financial Exposure Derivative financial instruments to manage financial exposure. Nexviazyme/Nexviadyme Nexviazyme/Nexviadyme [Member] Nexviazyme/Nexviadyme Net change in other non-current assets Net Change In Other Non-Current Assets Net change in other non-current assets. Current taxes Current tax expense (income) Expense recognized Total expense for restricted share plans Expense from equity-settled share-based payment transactions Hedging instruments [Member] Hedging instruments [domain] Assets held for sale Non-current assets or disposal groups classified as held for sale Later than one year and not later than five years Later than one year and not later than five years [member] Top of range Top of range [member] Employee-related expenses Expense Of Restructuring Activities, Employee Related Expenses Employee related expenses. Collaboration agreement development, regulatory and sales milestone payments Collaboration Agreement Development Regulatory And Sales Milestone Payments Collaboration Agreement Development Regulatory And Sales Milestone Payments Reclassified items [Axis] Reclassified items [axis] Intangible assets and goodwill [abstract] Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables Research and development expenses Research and development expenses Research and development expense Other changes in non-controlling interests Increase (Decrease) Through Changes In Non-controlling Interests Arising From Divestment And Acquisitions Increase (Decrease) Through Changes In Non-controlling Interests Arising From Divestment And Acquisitions Other non-current assets Other non-current assets Other non-current assets 2029 Later than three years and not later than four years [member] Diluted earnings per share from discontinued operations (in euros per share) Diluted earnings (loss) per share from discontinued operations Other investments Aggregated individually immaterial associates [member] Items not subsequently reclassifiable to profit or loss Other comprehensive income that will not be reclassified to profit or loss, net of tax Other operating expenses Other operating expense Miscellaneous other operating expense Miscellaneous other operating expense Tax effects Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss Joint ventures [Axis] Joint ventures [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [Axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Borrowings by name [Member] Borrowings by name [domain] Other related parties Other related parties [member] Hudson Headwaters Health Network Hudson Headwaters Health Network [Member] Hudson Headwaters Health Network Cross currency swap, expiring 2029 Cross Currency Swap, Expiring 2029 [Member] Cross Currency Swap, Expiring 2029 [Member] Deferred tax liabilities Deferred tax liabilities Geographical [Axis] Geographical [Axis] Income tax paid Income taxes paid (refund), classified as operating activities Other comprehensive income for the period Other comprehensive income Classes of liabilities [axis] Classes of liabilities [axis] Amortized cost Amortized Cost, Netting [Member] Amortized cost. Total other operating income Other Operating Income Other Operating Income Counterparties [Member] Counterparties [domain] Treasury shares Treasury shares [member] Cash and cash equivalents reclassified to Assets held for sale as of December 31, 2024 Cash and Cash Equivalents Reclassified to Assets Held for Sale Cash and Cash Equivalents Reclassified to Assets Held for Sale Net assets of Dynavax Identifiable assets acquired (liabilities assumed) Additional profit share for development cost Additional Profit Share For Development Cost [Member] Additional Profit Share For Development Cost Types of share-based payment arrangements [Axis] Types of share-based payment arrangements [axis] Cost of debt Interest expense on borrowings Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Table] Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Table] Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests Table Shire contingent consideration arising from acquisition of Translate Bio Shire Contingent Consideration Arising From Acquisition Of Translate Bio [Member] Shire Contingent Consideration Arising From Acquisition Of Translate Bio Capital increase by issuance of restricted shares (in shares) Number Of Restricted Shares Issued In Regards Of Capital Increase Number of restricted shares issued in regards of capital increase. Income tax expense Income Tax Expense (Benefit), Disposal Group Including Discontinued Operations Income Tax Expense (Benefit), Disposal Group Including Discontinued Operations Deferred taxes, net Net Deferred Tax Liabilities Recognised As Of AcquisitionDate Net Deferred Tax Liabilities Recognised As Of AcquisitionDate Tax effect related to amlitelimab Tax Effect Related To Amlitelimab Tax Effect Related To Amlitelimab Hedged items [Member] Hedged items [domain] Interests In Other Entities [Abstract] Interests In Other Entities [Abstract] Interests In Other Entities [Abstract] Gain on derivatives used to manage debt Gain (Loss) On Derivatives Used To Manage Debt Gain (loss) on derivatives used to manage debt. EUROAPI EUROAPI Euroapi [Member] Euroapi Attribution of expenses by nature to their function [domain] Attribution of expenses by nature to their function [domain] Fixed rate bond maturing may 2033 Fixed Rate Bond Maturing May 2033 [Member] Fixed Rate Bond Maturing May 2033 of which US dollar Cross Currency Seller Swaps In US Dollar [Member] Cross Currency Seller Swaps In US Dollar [Member] Subsidiaries [domain] Subsidiaries [domain] Other provisions Miscellaneous other provisions [member] Borrowings by name [Axis] Borrowings by name [axis] Net income from discontinued operations Profit (loss) from discontinued operations Derivative financial instruments Non-current derivative financial assets Summary of treasury shares held Disclosure of classes of share capital [text block] Market value At Market Value [member] At market value. Borrowings, interest rate Borrowings, interest rate Net cash provided by/(used in) investing activities Cash flows from (used in) investing activities Derivative financial instruments Disclosure of derivative financial instruments [text block] Cumulative consumer price inflation rate Cumulative Consumer Price Inflation Rate Over The Last Three Years Cumulative Consumer Price Inflation Rate Over The Last Three Years Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Pensions and other post-employment benefits Pensions And Other Post-Employment Benefits [Member] Pensions and other post-employment benefits. Summary of Non-Current Provisions and Other Non-Current Liabilities Disclosure Of Provisions And Other Non Current Liabilities Explanatory [Table Text Block] Disclosure Of Provisions And Other Non Current Liabilities Explanatory Investments in associates Investments in associates accounted for using equity method Amortization of intangible assets Amortization expense Amortisation, intangible assets other than goodwill Increase in fair value of liability Percentage Increase In Fair Value Liabilities Percentage increase in fair value liabilities. of which Chinese yuan renminbi Forward Currency Sales In Chinese Yuan Renminbi [member] Forward currency sales in Chinese Yuan Renminbi. Fair value of financial instruments Description of accounting policy for financial instruments [text block] Current assets Current assets Disclosure of operating segments [Table] Disclosure of operating segments [table] Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities Operating cash flow before changes in working capital Cash flows from (used in) operations before changes in working capital Disclosure of unaudited financial statements of subsidiaries explanatory Disclosure Of Unaudited Financial Statements Of Subsidiaries Explanatory [Table Text Block] Disclosure Of Unaudited Financial Statements Of Subsidiaries Explanatory L'Oréal L'Oréal [Member] L'Oréal Tax effects Income Tax Relating To Change In Fair Value Of Debt Instrument Excluding Equity Investments Income Tax Relating To Change In Fair Value Of Debt Instrument Excluding Equity Investments Of which capitalized interest Interest costs capitalised Segments [Axis] Segments [axis] Non-current income tax liabilities Current tax liabilities, non-current MSP Vaccine Company MSP Vaccine Company [Member] MSP Vaccine Company Disclosure of transactions between related parties [table] Disclosure of transactions between related parties [table] Charges, gains or losses on assets Expense Of Restructuring Activities, Related To Property Plant And Equipment And To Inventories Expense of restructuring activities related to property plant and equipment to inventories. Types of Hedges [Axis] Types of hedges [axis] Consolidation and foreign currency ranslation of the financial statements of subsidiaries in hyperinflationary economies Disclosure of information about hyperinflationary reporting [text block] Profit (loss) [abstract] Profit (loss) [abstract] Current income tax assets Current tax assets, current Sales to Opella Revenue from intragroup sales from continuing to discontinued operations Revenue from intragroup sales from continuing to discontinued operations Attribution of expenses by nature to their function [axis] Attribution of expenses by nature to their function [axis] Income taxes paid (refund) [abstract] Par value per share (in euros per share) Par value per share Property, plant and equipment Disclosure of property, plant and equipment [text block] Other revenues Other revenues Other revenue Of which Manufacturing & Supply Manufacturing And Supply [Member] Manufacturing and supply Change in fair value (investments accounted for using the equity method, net of taxes) Change In Fair Value On Debt Instrument Associates And Joint Ventures Change In Fair Value On Debt Instrument Associates And Joint Ventures Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] Restructuring costs and similar items Total Expense of restructuring activities Disclosure of operating segments [Line Items] Disclosure of operating segments [line items] Accounts receivable Disclosure Of Trade Receivables [Text Block] The disclosure of trade receivables. Costs of transformation programs Expense Of Restructuring Activities, Transformation Programs Costs Expense Of Restructuring Activities, Transformation Programs Costs RSV vaccines (Beyfortus) RSV Vaccines (Beyfortus) [Member] RSV Vaccines (Beyfortus) Provisions utilized Provision used, other provisions Value of services obtained from employees Increase (Decrease) Through Share-Based Payment Plans Value Of Services Obtained From Employees Value of services obtained from employees. Ranges [Member] Range [domain] Classes of Contingent Liabilities [Axis] Classes of contingent liabilities [axis] Debt Instrument [Domain] Debt Instrument [Domain] Debt Instrument [Domain] Overdue by 1-3 months Later than one month and not later than three months [member] Amlitelimab asset Amlitelimab Asset [Member] Amlitelimab Asset Proceeds from disposals of property, plant and equipment, intangible assets and other non-current assets, net of tax Proceeds from disposals of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets Number of class action lawsuits Number Of Class Action Lawsuits Number Of Class Action Lawsuits From €70.00 to €80.00 per share Exercise Price Range Three [Member] Exercise Price Range Three [Member] Amortisation of Inventories Amortization and Expenses from Inventories of Acquiree Since Acquisition Date Amortization and Expenses from Inventories of Acquiree Since Acquisition Date Disclosure of reconciliation of carrying amount to value on redemption [line items] Disclosure Of Reconciliation Of Carrying Amount To Value On Redemption [Line Items] Disclosure of reconciliation of carrying amount to value on redemption. Disclosure Of Off Balance Sheet Commitments [Table] Disclosure Of Off-Balance Sheet Commitments [Table] Disclosure Of Off Balance Sheet Commitments [Table] Fixed rate bond maturing May 2037 Fixed Rate Bond Maturing May 2037 [Member] Fixed Rate Bond Maturing May 2037 Tax effects Income Tax Relating To Change In Fair Value Of Equity Instruments Excluding Equity Method Income Tax Relating To Change In Fair Value Of Equity Instruments Excluding Equity Method Non-current income tax assets Current tax assets, non-current Notional amount Notional amount Income before tax and investments accounted for using the equity method, including gain on disposal of Opella before tax Income Before Tax And Investments Accounted For Using The Equity Method, Disposal Group Including Discontinued Operations Income Before Tax And Investments Accounted For Using The Equity Method, Disposal Group Including Discontinued Operations of which US dollar Forward Currency Purchases In US Dollar [Member] Forward currency purchases in USD. Schedule Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures Disclosure Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures Text Block [Text Block] Disclosure Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures Text Block [Table Text Block] Current lease liabilities Current lease liabilities Change in selling and general expenses, at constant exchange rates non-IFRS, percentage Increase (Decrease) In Selling And General Expenses, At Constant Exchange Rates Non-IFRS, Percentage Increase (Decrease) In Selling And General Expenses, At Constant Exchange Rates Non-IFRS, Percentage Purchases of goods and services (including research expenses) Purchases of goods, related party transactions Investments accounted for using the equity method Disclosure of investments accounted for using equity method [text block] Liability recognised for estimated future royalties Liability Recognised For Estimated Future Royalties Liability Recognised For Estimated Future Royalties Change in revenue, on a reported basis (IFRS), percentage Increase (Decrease) In Revenue, On A Reported Basis (IFRS), Percentage Increase (Decrease) In Revenue, On A Reported Basis (IFRS), Percentage Diluted earnings per share (in euros per share) Diluted earnings (loss) per share Fair value remeasurement of contingent consideration Increase (decrease) in contingent consideration asset (liability) Aggregated time bands [Member] Maturity [domain] Share of profit or loss from commercialization of monoclonal antibodies Share Of Profit Or Loss From Commercialization Of Monoclonal Antibodies [Member] Share of profit or loss from commercialization of monoclonal antibodies member. Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Other comprehensive income Other Comprehensive Income, Related Party Disclosures Other Comprehensive Income, Related Party Disclosures Effective tax rate Average effective tax rate Fair value At fair value [member] Summary of Reconciliation of Carrying Amount to Value on Redemption Disclosure Of Reconciliation Of Carrying Amount To Value On Redemption [Table Text Block] Disclosure of reconciliation of carrying amount to value on redemption [text block] Market Condition [Axis] Market Condition [Axis] Market Condition Overdue receivables gross value Overdue Receivables Gross Value Overdue receivables gross value. Other gains and losses, and litigation Disclosure Of Other Gains And Losses, And Litigation [Text Block] The entire disclosure of other gains and losses, and litigation. Summary of number of shares used to compute diluted earnings per share Earnings per share [text block] Number of cross currency swaps Number Of Cross Currency Swaps Number Of Cross Currency Swaps Share Repurchase 2026 Program Share Repurchase 2026 Program [Member] Share Repurchase 2026 Program Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table] Acquisitions of other intangible assets Purchase of intangible assets, classified as investing activities Change in currency translation differences: Foreign Currency Translation [Member] Foreign Currency Translation Operating income Operating Revenue, Disposal Group Including Discontinued Operations Operating Revenue, Disposal Group Including Discontinued Operations