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Principal accountants' fees and services (Tables) | 12 Months Ended
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Dec. 31, 2024
Analysis of income and expense [abstract] |
Disclosure of Accountants' Fees and Services | The table below shows fees charged by those firms and member firms of their networks to Sanofi and consolidated subsidiaries in the years ended December 31, 2024 and 2023.
| Forvis Mazars | PricewaterhouseCoopers | Ernst & Young
| 2024 | 2024 | 2023 | 2023
(€ million) | Amount | % | Amount | % | Amount | % | Amount | %
Statutory audit of separate and consolidated financial statements(a) | 11.5 | 93% | 19.7 | 73% | 14.7 | 72% | 15.1 | 74%
Limited review of sustainability statement(b) | 0.6 | 5% | 1.0 | 4% | — | —% | — | —%
Services other than statutory audit(c) | 0.2 | 2% | 6.4 | 23% | 5.8 | 28% | 5.4 | 26%
Audit-related services(d)(e) | 0.2 |  | 6.4 |  | 5.8 |  | 5.3 |
Tax | 0.0 |  | 0.0 |  | — |  | — |
Other | — |  | — |  | — |  | 0.1 |
Total | 12.3 | 100% | 27.1 | 100% | 20.5 | 100% | 20.5 | 100%
(a)Includes services provided by the independent auditors of the parent company and French subsidiaries: Forvis Mazars €4.8 million in 2024; PricewaterhouseCoopers Audit €12.5 million in 2024, €8.3 million in 2023 and Ernst & Young €7.9 million in 2023. (b)For SEC purposes, these Services are classified as Other. (c)Services other than statutory audit provided by Forvis Mazars during 2024 comprised: - assurance engagements, agreed-upon procedures, tax compliance work and technical consultancy. Services other than statutory audit provided by PricewaterhouseCoopers during 2024 comprised: - contractual audits, including on the combined financial statements of the Opella business; - additional procedures to enable reports previously signed by the firm to be incorporated by reference; and - assurance engagements, agreed-upon procedures, tax compliance work and technical consultancy. (d)Includes services provided by the independent auditors of the parent company and French subsidiaries: Forvis Mazars: €0.1 million in 2024,; PricewaterhouseCoopers Audit €3.5 million in 2024,€3.6 million in 2023 and Ernst & Young €5.2 million in 2023. (e)Includes €0.5 million for services that can only be provided by the statutory auditors, such as comfort letters, attestation services required by regulation (which qualify as audit fees under SEC rules).

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