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

Defined Benefit Plan, Actuarial Gain (Loss), Amortization Threshold Percentage

No definition available.

Name:	bhc_DefinedBenefitPlanActuarialGainLossAmortizationThresholdPercentage
Namespace Prefix:	bhc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration