SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basis of Presentation - Additional Information (Details) $ in Millions					3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 25, 2019 USD ($)	Mar. 16, 2018 USD ($) Product	Jul. 27, 2017 USD ($)	Mar. 16, 2016 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of segments | Segment									3
Total cash consideration, net of cash acquired					$ 109	$ 219	$ 111	$ 228	$ 418	$ 268	$ 686
Pre-tax charge recorded due to deconsolidation									$ 0	$ 0	33
Devaluation of Venezuelan Bolivar | Other (Income) Expense
Summary Of Significant Accounting Policies [Line Items]
Pre-tax charge recorded due to deconsolidation											$ (33)
Cheetah Medical, Inc.
Summary Of Significant Accounting Policies [Line Items]
Percentage of ownership acquired	100.00%
Total cash consideration, net of cash acquired	$ 195
Consideration transferred, additional potential amounts	40
Contingent consideration	18
Consideration transferred	$ 215
Mallinckrodt plc | RECOTHROM and PREVELEAK
Summary Of Significant Accounting Policies [Line Items]
Contingent consideration				$ 21
Number of products acquired | Product		2
Consideration transferred		$ 184		$ 184
Claris Injectables Limited
Summary Of Significant Accounting Policies [Line Items]
Percentage of ownership acquired			100.00%
Total cash consideration, net of cash acquired			$ 629