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LEGAL PROCEEDINGS - Legal Proceeds (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Legal matters and related fees	$ 175	$ 332

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- Definition

Legal settlements and Related Fees

+ References

No definition available.

+ Details

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Namespace Prefix:	bhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration