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Principal changes in the scope of consolidation in 2022 and 2021 - Additional Information (Details) € / shares in Units, $ / shares in Units, € in Millions, $ in Millions |  |  |  |  |  |  |  |  |  | 8 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Jun. 17, 2022 EUR (€) | May 10, 2022 EUR (€) € / shares shares | May 03, 2022 | Mar. 17, 2022 EUR (€) | Dec. 03, 2021 EUR (€) | Nov. 09, 2021 EUR (€) | Oct. 01, 2021 EUR (€) | Apr. 29, 2021 EUR (€) | Apr. 16, 2021 | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Feb. 08, 2022 EUR (€) | Feb. 08, 2022 USD ($) | Nov. 09, 2021 USD ($) $ / shares | Sep. 14, 2021 EUR (€) | Sep. 14, 2021 $ / shares | Aug. 03, 2021 $ / shares | Apr. 09, 2021 EUR (€) | Apr. 09, 2021 USD ($) | Apr. 08, 2021 EUR (€) | Apr. 08, 2021 USD ($) | Nov. 02, 2020 € / shares shares | Jun. 23, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition | [1] |  |  |  |  |  |  |  |  |  |  |  | € 3,870 | € 992 | € 5,594 |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 43,070 | 42,997 | 37,761 |  |  |  |  |  |  |  |  |  |  |  |
Exceptional supplementary dividends recognised as distributions to owners of parent | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 793 |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for using the equity method |  |  |  |  |  |  |  |  |  |  | € 677 | € 677 | 424 | 677 | 250 |  |  |  |  |  |  |  |  |  |  |  |
Other gains, (losses) and litigation |  |  |  |  |  |  |  |  |  |  |  |  | (38) | (370) | (5) |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (income) |  |  |  |  |  |  |  |  |  |  |  |  | (1,602) | (2,006) | (1,558) |  |  |  |  |  |  |  |  |  |  |  |
Disposal of consolidated undertakings and investments accounted for using the equity method, net of tax | [3] |  |  |  |  |  |  |  |  |  |  |  | € 42 | 134 | 42 |  |  |  |  |  |  |  |  |  |  |  |
Provision for decommissioning, restoration and rehabilitation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  | € 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory compliance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  | € 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EUROAPI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (in percent) |  |  |  |  |  |  |  |  |  |  | 30.10% |  | 29.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in subsidiary, minimum holding period |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for using the equity method |  |  |  |  |  |  |  |  |  |  | € 413 | 413 |  | 413 |  |  |  |  |  |  |  |  |  |  |  |  |
EUROAPI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exceptional supplementary dividend proposed, percentage of share capital |  |  |  |  | 58000000.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exceptional supplementary dividend, percentage of share capital |  |  | 58.00% | 58.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received (in shares) | shares |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special distribution, number of shares converted (in shares) | shares |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special distribution, percentage of share capital distributed |  |  | 57.88% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 486 |  |  |  |  |  |  |  |  |  |  |  |
Decrease through loss of control of subsidiary, net assets |  |  | € 1,227 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease through loss of control of subsidiary, intangible assets and goodwill |  |  | € 164 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price (in EUR per share) | € / shares |  |  | € 14.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange loss |  |  | € 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other gains, (losses) and litigation |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (income) |  |  | 111 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of consolidated undertakings and investments accounted for using the equity method, net of tax |  |  | € 101 |  |  |  |  |  |  |  |  |  |  | 101 |  |  |  |  |  |  |  |  |  |  |  |  |
EUROAPI | Manufacture and supply collaboration agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration agreement, period after loss of control |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration agreement, annual net sales target |  |  |  |  |  |  |  | € 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration agreement, commitment amount |  |  |  |  |  |  |  |  |  |  | € 1,100 | 1,100 |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |
EUROAPI | EPIC BPIFrance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests divested |  | 12000000.00% |  |  | 12000000.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, maximum amount |  | € 150 |  |  | € 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, valuation period |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Attributable to equity holders of Sanofi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exceptional supplementary dividends recognised as distributions to owners of parent | [2] |  |  |  |  |  |  |  |  |  |  |  |  | € 793 |  |  |  |  |  |  |  |  |  |  |  |  |
Amunix Pharmaceuticals, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 970 |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments, business combinations | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225 |  |  |  |  |  |  |  |  |  |
Contingent consideration recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 156 |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition |  |  |  |  |  |  |  |  |  |  |  | € 852 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 493 |  |  |  |  |  |  |  |  |  |  |
Kymab |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 973 | $ 1,100 |  |
Net cash flow on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 932 |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350 |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 965 |  |  |
Kiadis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 326 |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  | € 339 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares included in public offer (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,000,000 |
Purchase price per share (in euro/usd per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 5.45 |
Proportion of issued and outstanding share capital tendered into the public offer |  |  |  |  |  |  |  |  |  | 95.03% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial interest in principal fully consolidated companies |  |  |  |  |  |  |  |  | 97.39% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital owned (in percent) |  |  |  |  |  |  |  |  |  |  | 1.0000 | 1.0000 |  | 1.0000 |  |  |  |  |  |  |  |  |  |  |  |  |
Tidal Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 136 | $ 160 |  |  |  |
Net cash flow on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 310 |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 130 |  |  |  |  |
Translate Bio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 2,333 |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 396 |  |  |  |  |  |  |  |
Purchase price per share (in euro/usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 | $ 0.38 |  |  |  |  |  |
Investments, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Kadmon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition |  |  |  |  |  |  | € 1,575 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  | € 1,739 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per share (in euro/usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.50 |  |  |  |  |  |  |  |  |
Estimated purchase price on a fully-diluted basis | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |
Origimm Biotechnology GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred |  |  |  |  |  | € 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements |  |  |  |  |  | 95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  | € 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | This line item includes payments made in respect of contingent consideration identified and recognized as a liability in business combinations. For 2023, it includes the net cash outflow on the acquisitions of Provention Bio and QRIB (see Note D.1.). For 2022, it includes the net cash outflow on the acquisition of Amunix (see Note D.2.1.). For 2021, it includes the net cash outflows on the acquisitions of Kymab, Kiadis, Tidal, Translate Bio, Kadmon and Origimm (see Note D.2.2.).
[2] | This amount includes the valuation of the shares distributed as a dividend in kind, at a price of €14.58 per share, as of May 10, 2022 (see note D.2.1.).
[3] | For 2022, this line item includes the net cash inflows (before taxes) of €101 million on the divestment of EUROAPI (see Note D.2.1.).

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