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v3.20.4

SIGNIFICANT ACCOUNTING POLICIES - Employee Benefit Plans (Details) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Threshold percentage for amortization of net actuarial gains and losses | 10.00%

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- Definition Defined Benefit Plan, Actuarial Gain (Loss), Amortization Threshold Percentage + References No definition available. + Details
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Namespace Prefix: | bhc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration