ACQUISITIONS AND OTHER ARRANGEMENTS - Claris Injectables Limited Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended								6 Months Ended		12 Months Ended
	Jul. 27, 2017	Feb. 22, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquisitions And Collaborations [Line Items]
Total cash consideration, net of cash acquired						$ 109				$ 219	$ 111	$ 228	$ 418	$ 268	$ 686
Net sales			$ 3,039	$ 2,851	$ 2,834	$ 2,638	$ 2,833	$ 2,761	$ 2,813	$ 2,692	$ 5,472	$ 5,505	11,362	11,099	10,584
Claris Injectables Limited [Member]
Acquisitions And Collaborations [Line Items]
Percentage of ownership acquired	100.00%
Total cash consideration, net of cash acquired	$ 629
Measurement period adjustments, reduction in property, plant and equipment								2
Measurement period adjustments, increase in accounts payable and accrued liabilities								1
Measurement period adjustments, increase in other long-term liabilities								2
Measurement period adjustments, increase (decrease) in goodwill								$ 5
Net sales														140	57
Other intangible assets	280
Business acquisition settlement claims received		$ 73
Accrued liabilities released		$ 7
Business acquisition benefit of settlement claims and accrued liabilities released													(80)
Claris Injectables Limited [Member] | IPR&D
Acquisitions And Collaborations [Line Items]
Amount allocated from total consideration to acquire in-process research and development with indefinite useful life	$ 140
Claris Injectables Limited [Member] | IPR&D | Measurement Input Discount Rate
Acquisitions And Collaborations [Line Items]
Discount rate used to measure intangible assets	0.130
Claris Injectables Limited [Member] | Developed Technology Rights
Acquisitions And Collaborations [Line Items]
Other intangible assets	$ 140
Acquired intangible assets, weighted-average useful life	8 years
Claris Injectables Limited [Member] | Developed Technology Rights | Measurement Input Discount Rate
Acquisitions And Collaborations [Line Items]
Discount rate used to measure intangible assets	0.120
Claris Injectables Limited [Member] | Marketing and Administrative Expenses
Acquisitions And Collaborations [Line Items]
Integration costs													$ 27	$ 33	$ 28