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LEGAL PROCEEDINGS - Legal Proceeds (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Legal matters and related fees | $ 232 | $ 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