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Reporting Unit, Impairment Test, Long-Term Growth Rate

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Percentage of fair value of reporting unit in excess of carrying amount.

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No definition available.

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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 01, 2018	Jan. 01, 2018	Dec. 31, 2017
Goodwill [Line Items]
Impairment of intangible assets		$ 3,000,000	$ 34,000,000
Net loss attributable to Bausch Health Companies Inc.		(52,000,000)	$ (2,581,000,000)
Earnings per share, basic and diluted (in dollars per share)			$ (7.36)
Net carrying amount		11,683,000,000		$ 12,001,000,000
Goodwill impairment		0	$ 2,213,000,000
Percentage of fair value in excess of carrying value (more than)						15.00%
Goodwill		13,121,000,000		13,142,000,000			$ 15,593,000,000
Accumulated goodwill impairment charges		3,711,000,000
Ortho Dermatologics
Goodwill [Line Items]
Goodwill impairment				2,213,000,000
Dentistry Reporting Unit
Goodwill [Line Items]
Goodwill impairment	$ 109,000,000			$ 109,000,000
Reporting Units Excluding Dentistry
Goodwill [Line Items]
Goodwill impairment	$ 0
Branded Rx \| Adjustments
Goodwill [Line Items]
Goodwill					$ 115,000,000
Branded Rx \| Salix
Goodwill [Line Items]
Goodwill impairment			1,970,000,000
Branded Rx \| Ortho Dermatologics
Goodwill [Line Items]
Goodwill impairment			243,000,000
Bausch Lomb/International And U.S. Diversified Products Segments \| Adjustments
Goodwill [Line Items]
Goodwill			(115,000,000)
Minimum
Goodwill [Line Items]
Reporting unit, impairment test, long-term growth rate	1.00%
Reporting unit, impairment test, estimated cash flows, discount rate	7.50%
Maximum
Goodwill [Line Items]
Reporting unit, impairment test, long-term growth rate	3.00%
Reporting unit, impairment test, estimated cash flows, discount rate	14.00%
Xifaxan
Goodwill [Line Items]
Net carrying amount		4,713,000,000
Xifaxan \| Intangible Assets, Amortization Period
Goodwill [Line Items]
Net loss attributable to Bausch Health Companies Inc.		$ 118,000,000
Earnings per share, basic and diluted (in dollars per share)		$ 0.34
Held-for-sale
Goodwill [Line Items]
Impairment of long-lived assets			4,000,000
Product/patent assets
Goodwill [Line Items]
Impairment of finite-lived intangible assets			$ 6,000,000