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Other non-current assets - Additional Information (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Aug. 31, 2022 EUR (€)
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Pre-tax impact on other comprehensive income |  | € 47 |  |  |
Non-current finance lease receivables |  | 116 | € 132 |  |
Non-current finance lease receivables, gross |  | 181 | 195 |  |
BioAtrium |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Non-current Loans And Receivable |  | 149 |  |  |
EUROAPI | Associates and joint ventures |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Subordinate Hybrid Bond, Related Party Transactions |  | € 189 |  | € 200 |
Fair value of SPMSD contingent consideration |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Increase In Contingent Consideration |  | 700.00% |  |  |
Quoted euro denominated senior bonds |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Debt instruments at fair value through other comprehensive income |  | € 357 |  |  |
Senior bond |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Financial assets held for investments |  |  |  | 329 |
Held-to-maturity investment |  |  | 346 |  |
Financial instruments held to fund deferred compensation plan |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Financial investments |  | 688 | 572 | 512 |
Trading equity securities |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Fair value through other comprehensive income |  | 1,559 | 1,088 | 936 |
Trading equity securities | Level 1 |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Fair value through other comprehensive income |  | 467 | 470 | 387 |
Unquoted equity investments |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | 1,092 | 618 | 549 |
Unquoted equity investments | Quoted euro denominated senior bonds |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Exchange for financial assets held to meet obligations to employees under post-employment benefit plans |  | 110 |  |  |
Commitments related to unquoted debt securities |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | 360 | 65 |  |
Financial assets at fair value through profit or loss |  | 168 | 159 |  |
Commitments related to unquoted debt securities | Orano Med |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | 300 |  |  |
Quoted equity securities |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Unrealized after-tax losses |  | 342 | 349 | 256 |
SPMSD contingent consideration asset |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Fair value of the contingent consideration |  | 113 | 214 | 303 |
Non-current assets | Fair value of SPMSD contingent consideration |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Fair value of the contingent consideration |  |  | 104 | 196 |
Unquoted debt securities not meeting the definition of equity instruments |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Financial assets at fair value through profit or loss |  | 165 | € 132 | 115 |
Discovery Design and Clinical Development | Orano Med |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | € 1,900 |  |  |
Proportion of ownership interests held by non-controlling interests |  | 16.00% |  |  |
Non Current Asset |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Fair value of the contingent consideration |  | € 104 |  |  |
Increase of ten percent basis point in market interest rate | Debt instruments |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Other comprehensive income before tax |  | 1 |  |  |
Increase of ten percent basis point in market interest rate | Quoted debt instruments |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Other comprehensive income before tax |  | € 1 |  |  |
Regeneron |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ | $ 174 |  |  |  |
Innovent Biologics |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |
Investments in equity instruments designated at fair value through other comprehensive income, transaction amount |  |  |  | € 228 | € 250

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