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Disclosures about major customers and credit risk (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of information about major customers and credit risk [line items] |  |  |
Percentage of entity's revenue (in percent) |  |  | 5.00%
Largest customers |  |  |
Disclosure of information about major customers and credit risk [line items] |  |  |
Percentage of entity's revenue (in percent) | 27.00% |  |
Customer one |  |  |
Disclosure of information about major customers and credit risk [line items] |  |  |
Percentage of entity's revenue (in percent) | 12.00% | 10.00% | 10.00%
Customer two |  |  |
Disclosure of information about major customers and credit risk [line items] |  |  |
Percentage of entity's revenue (in percent) | 8.00% | 7.00% | 6.00%
Customer three |  |  |
Disclosure of information about major customers and credit risk [line items] |  |  |
Percentage of entity's revenue (in percent) | 7.00% | 6.00% |

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- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_34&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of information about major customers and credit risk. + References No definition available. + Details
Name: | sny_DisclosureOfInformationAboutMajorCustomersAndCreditRiskLineItems
Namespace Prefix: | sny_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=sny_LargestCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=sny_CustomerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=sny_CustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=sny_CustomerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |