OTHER EXPENSE (INCOME), NET - Schedule of Other Expense (Income), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Other Income And Expenses [Line Items]
Net (gain) loss on other sales of assets	$ (31)	$ 6	$ 37
Litigation and other matters	1,401	(27)	226
Acquired in-process research and development costs	41	1	5
Acquisition-related costs	8	1	0
Other, net	(5)	(1)	1
Other expense (income), net	1,414	(20)	(348)
Skincare Brand
Schedule Of Other Income And Expenses [Line Items]
(Gain) loss on sale	0	0	(309)
iNova
Schedule Of Other Income And Expenses [Line Items]
(Gain) loss on sale	0	0	(309)
Dendreon
Schedule Of Other Income And Expenses [Line Items]
(Gain) loss on sale	0	0	(97)
Sprout
Schedule Of Other Income And Expenses [Line Items]
(Gain) loss on sale	$ 0	$ 0	$ 98