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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
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LEGAL PROCEEDINGS AND CONTINGENCIES (Details) $ in Millions	1 Months Ended
LEGAL PROCEEDINGS AND CONTINGENCIES (Details) $ in Millions	May 31, 2024 USD ($)	Feb. 28, 2021 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2018 lawsuit
Legal Proceedings and Contingencies [Line Items]
Obligation to holders of the contingent value rights				$ 6,400
Accrued liabilities for CERCLA matters			$ 64
Attorney General of Hawaii v. Bristol-Myers Squibb and Sanofi
Legal Proceedings and Contingencies [Line Items]
Litigation settlement, amount awarded to other party	$ 458	$ 417
Attorney General of Hawaii v. Bristol-Myers Squibb and Sanofi \| BMS and Sanofi
Legal Proceedings and Contingencies [Line Items]
Litigation settlement, amount awarded to other party	$ 916	$ 834
Celgene Securities Class Action
Legal Proceedings and Contingencies [Line Items]
Putative claims \| lawsuit					2