Company Information - Creation of Inventiva U.S. subsidiary (Details)			12 Months Ended
Mar. 31, 2021	Jan. 05, 2021	Dec. 31, 2021
Inventiva Inc.
Disclosure of other provisions [line items]
Percent of Ownership Interest	100.00%	100.00%	100.00%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 27
-IssueDate 2021-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
-Paragraph 16
-Subparagraph b
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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