OTHER (INCOME) EXPENSE, NET - Summary of Other (Income) Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule Of Other Income And Expenses [Line Items]
Net loss (gain) on other sales of assets	$ 0	$ 0	$ 25	$ (9)
Deconsolidation of Philidor	0	0	0	19
Litigation and other matters	3	1	112	(32)
Other, net	0	0	(1)	2
Other income, net	(325)	1	(584)	(20)
Salix | Xifaxan®, Relistor® and Apriso®
Schedule Of Other Income And Expenses [Line Items]
Litigation and other matters				(39)
iNova
Schedule Of Other Income And Expenses [Line Items]
Gain on sale of business	(306)	0	(306)	0
Skincare Sale
Schedule Of Other Income And Expenses [Line Items]
Gain on sale of business	3	0	(316)	0
Dendreon Sale
Schedule Of Other Income And Expenses [Line Items]
Gain on sale of business	$ (25)	$ 0	$ (98)	$ 0