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Financial assets and liabilities measured at fair value - Summary of Assets and Liabilities Measured at Fair Value (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | € 115 | € 78 | € 63
Level 1 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 10,765 | 6,449 | 10,022
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 1 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 387 | 396 | 439
Level 1 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 329 | 447 | 426
Level 1 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 512 | 549 | 454
Level 1 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 1 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 9,537 | 5,057 | 8,703
Level 2 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 206 | 298 | 82
Total financial liabilities measured at fair value | 326 | 85 | 297
Level 2 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 2 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 232 | 6 | 92
Level 2 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 94 | 79 | 205
Level 2 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 2 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 3 | 24
Level 2 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 206 | 295 | 58
Level 2 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 967 | 883 | 695
Total financial liabilities measured at fair value | 779 | 714 | 605
Level 3 | Bayer contingent purchase consideration arising from the acquisition of Genzyme |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 26 | 59 | 104
Level 3 | MSD contingent consideration (European vaccines business) |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 204 | 269 | 312
Level 3 | Shire contingent consideration arising from the acquisition of Translate Bio |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 380 | 354 | 0
Level 3 | Contingent consideration arising from acquisition of Amunix |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 165 | 0 | 0
Level 3 | Other contingent consideration arising from business combinations and acquisitions |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 4 | 32 | 189
Level 3 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 3 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial liabilities measured at fair value | 0 | 0 | 0
Level 3 | Quoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Unquoted equity investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 549 | 427 | 149
Level 3 | Quoted debt securities |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Unquoted debt securities not meeting the definition of equity instruments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 115 | 78 | 63
Level 3 | Contingent consideration relating to divestments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 303 | 378 | 483
Level 3 | Financial assets held to meet obligations under deferred compensation plans |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Non-current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Current derivatives |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | 0 | 0 | 0
Level 3 | Mutual fund investments |  |  |
Disclosure of information on income statement [line items] |  |  |
Total financial assets measured at fair value | € 0 | € 0 | € 0

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
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