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Principal changes in the scope of consolidation in 2023 - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2023 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Sep. 29, 2023 EUR (€) | Sep. 29, 2023 USD ($) | Apr. 27, 2023 USD ($) $ / shares | Mar. 13, 2023 USD ($) $ / shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Net cash flow on acquisition | € | [1] |  | € 3,870,000,000 |  | € 992,000,000 | € 5,594,000,000 |  |  |  |
Goodwill, tax deductible period |  |  | 15 years | 15 years |  |  |  |  |  |
Provention Bio, Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Investments, ownership percentage |  |  |  |  |  |  |  |  |  | 3.00%
Provention Bio, Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Purchase price per share (in euro/usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 25.00 | $ 25.00
Cash transferred |  |  |  |  |  |  |  |  |  | $ 2,800
Equity interest in acquiree held before acquisition date |  |  |  |  |  |  |  |  | $ 68 |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  | 2,806 |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  |  | $ 2,810 |
Net cash flow on acquisition |  |  |  | $ 2,722 |  |  |  |  |  |
QRIB Intermediate Holding |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | € |  |  |  |  |  |  | € 1,342,000,000 |  |  |
Identifiable intangible assets recognised as of acquisition date | € |  |  |  |  |  |  | € 774,000,000 |  |  |
Net cash flow on acquisition |  |  |  | $ 1,410 |  |  |  |  |  |
Business combination, purchase price |  |  |  |  |  |  |  | $ 1,419 |  |
Contributions from acquiree to net sales | € |  | € 71,000,000 |  |  |  |  |  |  |  |
Contributions from acquiree to net income | € |  | € 0 |  |  |  |  |  |  |  |
Acquisition-related costs | € |  |  | € 0 |  |  |  |  |  |  |
[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.).

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