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Legal and arbitral proceedings (Details) € in Millions, $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended | 60 Months Ended |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2021 EUR (€) plaintiff complaint | May 14, 2013 EUR (€) | Jan. 31, 2023 | Oct. 31, 2022 medical_assessment | Sep. 30, 2022 expert | Aug. 31, 2022 decision | Jul. 31, 2021 manufacturer | Feb. 28, 2021 USD ($) | Jan. 31, 2021 decision | Oct. 31, 2018 USD ($) | Sep. 30, 2017 EUR (€) | Mar. 31, 2021 proceeding | Dec. 31, 2022 EUR (€) manufacturer trial case person children complaint lawsuit claim family patent | Dec. 31, 2021 EUR (€) action | Dec. 31, 2022 EUR (€) manufacturer trial case person children complaint lawsuit claim family | Dec. 31, 2022 AUD ($) manufacturer trial case person children complaint lawsuit claim family | Dec. 06, 2022 cancer case | Aug. 20, 2022 ruling | May 12, 2022 ruling | Dec. 31, 2020 EUR (€) | Jul. 31, 2020 claim family | Dec. 31, 2014 complaint | Nov. 18, 2014 patent | Apr. 30, 2013 AUD ($) | Dec. 31, 1997 EUR (€)
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions for product liability risks, litigation and other | € 1,374.0 |  |  |  |  |  |  |  |  |  |  |  | € 1,652.0 | € 1,374.0 | € 1,652.0 |  |  |  |  | € 1,262.0 |  |  |  |  |
Environmental risks | € 650.0 |  |  |  |  |  |  |  |  |  |  |  | € 526.0 | € 650.0 | € 526.0 |  |  |  |  | € 713.0 |  |  |  |  |
Number of cases dismissed | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |
Number of cancers associated with dismissed cases | cancer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of first instance rulings |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 | 3 |  | 7 | 7 |  |  |  |  |  |
Action for which we are defendant | Product liabilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation amount payable |  |  |  |  |  |  |  |  |  |  |  |  | € 0.1 |  | € 0.1 |  |  |  |  |  |  |  |  |  |
Action for which we are defendant | Product liabilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation amount payable |  |  |  |  |  |  |  |  |  |  |  |  | € 0.5 |  | € 0.5 |  |  |  |  |  |  |  |  |  |
Sanofi Pasteur Hepatitis B Vaccine product litigation | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of civil individual actions | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 180 |  | 180 | 180 |  |  |  |  |  |  |  |  |
Number of ongoing lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 49 |  | 49 | 49 |  |  |  |  |  |  |  |  |
Taxotere product litigation in the US | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 8,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loss consortium plaintiffs | plaintiff | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bellweather trial held | trial |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 | 2 |  |  |  |  |  |  |  |  |
Taxotere mississippi attorney general litigation in the US | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum penalty amount sought by plaintiffs for each violation | $ |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zantac litigation in the US | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 68,355 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints filed | complaint | 3,486 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zantac litigation in Canada | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class actions | action |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |
Depakine product litigation In France | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of civil individual actions | claim |  |  |  |  |  |  |  |  |  |  |  |  | 78 |  | 78 | 78 |  |  |  |  |  |  |  |  |
Number of people exposed | person |  |  |  |  |  |  |  |  |  |  |  |  | 131 |  | 131 | 131 |  |  |  |  |  |  |  |  |
Number of lawsuits ruled on merits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 29 |  | 29 | 29 |  |  |  |  |  |  |  |  |
Number of families who filed a civil claim | family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63 |  |  |  |
Number of experts | expert |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of medical assessments | medical_assessment |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people exposed who filed a request for indemnification | person |  |  |  |  |  |  |  |  |  |  |  |  | 63 |  | 63 | 63 |  |  |  |  |  |  |  |  |
Number of administrative proceedings | proceeding |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Depakine product litigation in Switzerland | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people exposed | person |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  | 16 | 16 |  |  |  |  |  |  |  |  |
Number of families who filed a civil claim | family |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  | 10 | 10 |  |  |  |  |  |  |  |  |
Depakine product litigation in Spain | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people exposed | children |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  | 10 | 10 |  |  |  |  |  |  |  |  |
Number of ongoing trials | trial |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 4 | 4 |  |  |  |  |  |  |  |  |
Depakine product litigation in Belgium | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of civil individual actions | complaint |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 | 2 |  |  |  |  |  |  |  |  |
Depakine product litigation in Germany | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of civil individual actions | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 | 1 |  |  |  |  |  |  |  |  |
Number of people exposed | children |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 | 1 |  |  |  |  |  |  |  |  |
Dengvaxia product litigation in the Philippines | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Ramipril Canada Patent Litigation | Action for which we are a plaintiff | Patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of manufacturers with marketing authorization for generic version of drug | manufacturer |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  | 8 | 8 |  |  |  |  |  |  |  |  |
Praluent (Alirocumab)-related amgen patent litigation in the US | Action for which we are defendant | Patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patent actions initially filed | complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Number of patents allegedly infringed | patent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Jevtana related patent litigation in the US | Action for which we are a plaintiff | Patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Number of patents covering product | patent |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Number of decisions issued by the District Court | decision |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days after the completion of the post-trial briefing (in days) |  |  |  |  |  |  |  |  |  |  |  |  | 120 days |  |  |  |  |  |  |  |  |  |  |  |
Jevtana related patent litigation in the US | Action for which we are a plaintiff | Patents | Commencement of major litigation [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of trial (in days) |  |  | 3 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plavix litigation (Commonwealth) in Australia | Action for which we are defendant | Patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of damages sought by Australian Department of Health related to the Apotex preliminary injunction, up to |  |  |  |  |  |  |  |  |  |  |  |  | € 286.0 |  | € 286.0 |  |  |  |  |  |  |  |  | $ 449.0 |
Plavix litigation (Commonwealth) in Australia | Action for which we are defendant | Patents | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced amount of compensation claimed |  |  |  |  |  |  |  |  |  |  |  |  | 142.1 |  | 142.1 | $ 223.3 |  |  |  |  |  |  |  |  |
Reduced amount of compensation claimed, interest included |  |  |  |  |  |  |  |  |  |  |  |  | 218.6 |  | 218.6 | 343.4 |  |  |  |  |  |  |  |  |
Plavix litigation (Commonwealth) in Australia | Action for which we are defendant | Patents | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced amount of compensation claimed |  |  |  |  |  |  |  |  |  |  |  |  | 178.4 |  | 178.4 | 280.2 |  |  |  |  |  |  |  |  |
Reduced amount of compensation claimed, interest included |  |  |  |  |  |  |  |  |  |  |  |  | € 295.1 |  | € 295.1 | $ 463.6 |  |  |  |  |  |  |  |  |
Plavix Attorney General Action in Hawaii | Action for which we are defendant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total penalty fee incurred by defendants | $ |  |  |  |  |  |  |  | $ 834,012,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalty fee incurred by Sanofi | $ |  |  |  |  |  |  |  | $ 417,006,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plavix related litigation in France | Action for which we are defendant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalty fee incurred by Sanofi |  | € 40.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of damages claimed by the French CNAM (French Social Security) |  |  |  |  |  |  |  |  |  |  | € 115.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
340B Drug Pricing Program in the United States | Action for which we are defendant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other manufacturers involved in proceedings | manufacturer |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aventis Crop Science retained liabilities | Contingencies arising from certain business divestitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate participation percentage of legacy companies in ACS |  |  |  |  |  |  |  |  |  |  |  |  | 76.00% |  |  |  |  |  |  |  |  |  |  |  |
Infraserv Hoechst retained liabilities | Contingencies arising from certain business divestitures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fund reserves transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 57.0
Maximum amount to be reimbursed for current and future environmental expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 143.0
Depakine Product Litigation In Ireland | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-action protocol cases | case |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 | 2 |  |  |  |  |  |  |  |  |
Number of civil claims on-going | claim |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 | 2 |  |  |  |  |  |  |  |  |
Depakine Product Litigation In Great Britain | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-action protocol cases | case |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 | 3 |  |  |  |  |  |  |  |  |
Depakine Product Litigation In Northern Ireland | Action for which we are defendant | Product liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Legal and Arbitral Proceedings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-action protocol cases | case |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 | 1 |  |  |  |  |  |  |  |  |

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