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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, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Aug. 31, 2022 EUR (€) | Sep. 14, 2021
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Pre-tax impact on other comprehensive income |  | € 47 |  |  |  |
Quoted euro denominated senior bonds |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Debt instruments at fair value through other comprehensive income |  | 346 |  |  |  |
Senior bond |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Financial assets held for investments |  |  | € 329 | € 447 |  |
Financial instruments held to fund deferred compensation plan |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Financial investments |  | 572 | 512 | 549 |  |
Trading equity securities |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Fair value through other comprehensive income |  | 1,088 | 936 | 823 |  |
Trading equity securities | Level 1 |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Fair value through other comprehensive income |  | 470 | 387 | 396 |  |
Unquoted equity investments |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | 618 | 549 | 427 |  |
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 |  | 107 |  |  |  |
Commitments related to unquoted debt securities |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  | 65 | 60 |  |  |
Financial assets at fair value through profit or loss |  | 159 | 192 |  |  |
Quoted equity securities |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Unrealized after-tax losses |  | 349 | 256 | 322 |  |
SPMSD contingent consideration asset |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Fair value of the contingent consideration |  | 214 | 303 | 378 |  |
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 | 275 |  |
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 |  | 132 | 115 | € 78 |  |
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 |
Translate Bio |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |
Investments, ownership percentage |  |  |  |  |  | 5.00%

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