SUPPLEMENTARY DATA (UNAUDITED) - Schedule of Unaudited Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 2,224	$ 2,209	$ 2,152	$ 2,016	$ 2,121	$ 2,136	$ 2,128	$ 1,995	$ 8,601	$ 8,380	$ 8,724
Expenses	3,300	1,880	1,895	1,729	2,096	2,019	2,373	4,276	8,804	10,764	8,622
Operating (loss) income	(1,076)	329	257	287	25	117	(245)	(2,281)	(203)	(2,384)	102
Net loss attributable to Bausch Health Companies Inc.	$ (1,516)	$ (49)	$ (171)	$ (52)	$ (344)	$ (350)	$ (873)	$ (2,581)	(1,788)	(4,148)	2,404
Basic and Diluted loss per share attributable to Bausch Health Companies Inc. (in dollars per share)	$ (4.30)	$ (0.14)	$ (0.49)	$ (0.15)	$ (0.98)	$ (1.00)	$ (2.49)	$ (7.36)
Net cash provided by operating activities	$ 234	$ 515	$ 339	$ 413	$ 319	$ 522	$ 222	$ 438	$ 1,501	$ 1,501	$ 2,290