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Other non-current assets - Additional Information (Details) € in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 29, 2020 EUR (€) shares | Oct. 31, 2022 EUR (€) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€) shares | Aug. 31, 2022 EUR (€) | Sep. 14, 2021 | Jun. 23, 2020
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  | € 0 | € 0 | € 10,370 | [1] |  |  |
Pre-tax impact on other comprehensive income |  |  |  | € 39 |  |  |  |  |  |
Fair value of SPMSD contingent consideration |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Increase in contingent consideration |  |  |  | 1.00% |  |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Total financial assets measured at fair value |  |  |  | € 10,765 | 6,449 | 10,022 |  |  |  |
Quoted euro denominated senior bonds |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments at fair value through other comprehensive income |  |  |  | 329 |  |  |  |  |  |
Senior bond |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Financial assets held for investments |  |  |  |  | 447 | 426 |  |  |  |
Financial instruments held to fund deferred compensation plan |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Financial investments |  |  |  | 512 | 549 | 453 |  |  |  |
Trading equity securities |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value through other comprehensive income |  |  |  | 936 | 823 | 588 |  |  |  |
Trading equity securities | Level 1 |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value through other comprehensive income |  |  |  | 387 | 396 | 439 |  |  |  |
Unquoted equity investments |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in equity instruments designated at fair value through OCI |  |  |  | 549 | 427 | 149 |  |  |  |
Gain on disposal |  | € 175 |  |  |  |  |  |  |  |
Unquoted equity investments | Onduo |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 19.00% |  |  |  |  |  |  |  |
Unquoted equity investments | Level 1 |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Total financial assets measured at fair value |  |  |  | 0 | 0 | 0 |  |  |  |
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 |  |  |  | 104 |  |  |  |  |  |
Quoted equity securities |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized after-tax losses |  |  |  | (256) | (322) | 200 |  |  |  |
SPMSD contingent consideration asset |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of the contingent consideration |  |  |  | 303 | 378 | 483 |  |  |  |
Non current asset | Fair value of SPMSD contingent consideration |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of the contingent consideration |  |  |  | 196 | 275 | 374 |  |  |  |
Unquoted debt securities not meeting the definition of equity instruments |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Total financial assets measured at fair value |  |  |  | 115 | 78 | 63 |  |  |  |
Unquoted debt securities not meeting the definition of equity instruments | Level 1 |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Total financial assets measured at fair value |  |  |  | 0 | € 0 | 0 |  |  |  |
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 |  |  |  |  |  |
Translate Bio |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in equity instruments designated at fair value through OCI, ownership percentage |  |  |  |  |  |  |  |  |  | 5.00%
Translate Bio |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Investments in equity instruments designated at fair value through OCI, ownership percentage |  |  |  |  | 8.00% |  |  |  | 5.00% |
Investments in equity instruments designated at fair value through OCI |  |  |  |  | € 74 |  |  |  |  |
Regeneron |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value through other comprehensive income | € 221 |  |  |  |  | € 111 |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ |  |  | $ 174 |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares | 22,800,000 |  |  |  |  |  |  |  |  |
Non-current financial assets, number of shares (in shares) | shares | 400,000 |  |  |  |  | 279,766,000,000 |  |  |  |
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 |  |
Associates | Trading equity securities |  |  |  |  |  |  |  |  |  |
Disclosure Of Other Non Current Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value through other comprehensive income |  |  |  |  |  | € 357 |  |  |  |
[1] | (j) Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.

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