SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)	12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]
Tax benefit recognition, measurement percentage (greater than)	50.00%
Minimum period to classify uncertain tax position liabilities as long term liabilities	1 year

Represents the minimum period to classify uncertain tax position liabilities as long term liabilities.

No definition available.

Name:	bhc_MinimumPeriodToClassifyUncertainTaxPositionLiabilitiesAsLongTermLiabilities
Namespace Prefix:	bhc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration