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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Corporate information and statement of IFRS compliance [abstract] |  |
Summary of Useful Lives of Property, Plant and Equipment | The customary useful lives of property, plant and equipment are as follows:
Buildings | 15 to 40 years
Fixtures | 10 to 20 years
Machinery and equipment | 5 to 15 years
Other | 3 to 15 years
Disclosure of Detailed Information about Financial Instruments |  | The table below shows the disclosures required under IFRS 7 relating to the measurement principles applied to financial instruments.
Note | Type of financial instrument | Measurement principle | Level in fair value hierarchy | Valuation technique | Method used to determine fair value
Valuation model | Market data
Exchange rate | Interest rate
D.7. | Financial assets measured at fair value (quoted equity instruments) | Fair value | 1 | Market value | Quoted market price |  | N/A
D.7. | Financial assets measured at fair value (quoted debt instruments) | Fair value | 1 | Market value | Quoted market price |  | N/A
D.7. | Financial assets measured at fair value (unquoted equity instruments) | Fair value | 3 | Cost/ Approach based on comparables | If cost ceases to be a representative measure of fair value, an internal valuation is carried out, based mainly on comparables.
D.7. | Financial assets measured at fair value (contingent consideration receivable) | Fair value | 3 | Revenue- based approach | The fair value of contingent consideration receivable is determined by adjusting the contingent consideration at the end of the reporting period using the method described in Note D.7.3.
D.7. | Financial assets measured at fair value held to meet obligations under post-employment benefit plans | Fair value | 1 | Market value | Quoted market price |  | N/A
D.7. | Financial assets designated at fair value held to meet obligations under deferred compensation plans | Fair value | 1 | Market value | Quoted market price |  | N/A
D.7. | Long-term loans and advances and other non-current receivables | Amortized cost | N/A | N/A | The amortized cost of long-term loans and advances and other non-current receivables at the end of the reporting period is not materially different from their fair value.
D.13. | Investments in mutual funds | Fair value | 1 | Market value | Net asset value |  | N/A
D.13. | Negotiable debt instruments, commercial paper, instant access deposits and term deposits | Amortized cost | N/A | N/A | Because these instruments have a maturity of less than three months, amortized cost is regarded as an acceptable approximation of fair value as disclosed in the notes to the consolidated financial statements.
D.17.1., D.19. | Debt | Amortized cost(a) | N/A | N/A | In the case of debt with a maturity of less than three months, amortized cost is regarded as an acceptable approximation of fair value as reported in the notes to the consolidated financial statements. For debt with a maturity of more than three months, fair value as reported in the notes to the consolidated financial statements is determined either by reference to quoted market prices at the end of the reporting period (quoted instruments) or by discounting the future cash flows based on observable market data at the end of the reporting period (unquoted instruments). For financial liabilities based on variable payments such as royalties, fair value is determined on the basis of discounted cash flow projections.
D.17.2. | Lease liabilities | Amortized cost | N/A | N/A | The liability for future lease payments is discounted using the incremental borrowing rate.
D.20. | Forward currency contracts | Fair value | 2 |  | Present value of future cash flows | Mid Market | < 1 year: Mid Money Market > 1 year: Mid Zero Coupon
D.20. | Interest rate swaps | Fair value | 2 | Revenue- based approach | Present value of future cash flows | Mid Market Spot | < 1 year: Mid Money Market and LIFFE interest rate futures > 1 year: Mid Zero Coupon
D.20. | Cross-currency swaps | Fair value | 2 |  | Present value of future cash flows | Mid Market Spot | < 1 year: Mid Money Market and LIFFE interest rate futures > 1 year: Mid Zero Coupon
D.18. | Liabilities related to business combinations and to non-controlling interests (CVRs) | Fair value | 1 | Market value | Quoted market price |  |
D.18. | Liabilities related to business combinations and to non-controlling interests (other than CVRs) | Fair value | 3 | Revenue- based approach | Under IAS 32, contingent consideration payable in a business combination is a financial liability. The fair value of such liabilities is determined by adjusting the contingent consideration at the end of the reporting period using the method described in Note B.8.4.
(a)In the case of debt designated as a hedged item in a fair value hedging relationship, the carrying amount in the consolidated balance sheet includes changes in fair value attributable to the hedged risk(s).

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