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Cash and cash equivalents (Details) - EUR (€) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | [2]
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Subclassifications of assets, liabilities and equities [abstract] |  |  |  |  |  |  |
Cash |  | € 1,270,000,000 | € 1,461,000,000 |  | € 1,385,000,000 |  |
Cash equivalents | [1] | 6,171,000,000 | 7,249,000,000 |  | 11,351,000,000 |  |
Cash and cash equivalents |  | 7,441,000,000 | 8,710,000,000 | [2] | 12,736,000,000 | [2] | € 10,098,000,000
Cash equivalents, money market mutual funds |  | 4,161,000,000 | 5,349,000,000 |  | 9,537,000,000 |  |
Cash equivalents, term deposits |  | 1,293,000,000 | 1,191,000,000 |  | 1,167,000,000 |  |
Cash equivalents, commercial paper |  | 0 | 0 |  |  |  |
Cash equivalents, captive insurance and reinsurance companies |  | € 446,000,000 | € 476,000,000 |  | € 439,000,000 |  |
[1] | (a)As of December 31, 2024, cash equivalents mainly comprised the following: (i) €4,161 million invested in euro and US dollar denominated money-market mutual funds (December 31, 2023: €5,349 million; December 31, 2022: €9,537 million); (ii) €1,293 million of term deposits (December 31, 2023: €1,191 million; December 31, 2022: €1,167 million) and (iii) zero commercial paper (December 31, 2023: zero; December 31, 2022: zero). Cash equivalents also include €446 million held by captive insurance and reinsurance companies in accordance with insurance regulations (December 31, 2023: €476 million; December 31, 2022: €439 million).
[2] | Cash flows of the Opella business are presented separately in accordance with IFRS 5 (Non-Current Assets Held for Sale and Discontinued Operations).

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- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Cash equivalents captive insurance and reinsurance companies. + References No definition available. + Details
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