RESTRUCTURING AND INTEGRATION COSTS - Narrative (Details) $ in Millions	6 Months Ended		27 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) employee
Other Restructuring, Integration-related and Other Costs
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	$ 40		$ 40
Incurred restructuring costs	30	$ 35
Restructuring payments	44	39
Restructuring costs integration consulting duplicate labor transition service and other	15	25
Business exit costs	8	4
Severance costs	7	6
Salix
Cost-rationalization and integration initiatives
Approximate number of employees expected to be terminated | employee			475
Restructuring and acquisition-related costs since acquisition date			$ 273
Integration expenses related to acquisition, since acquisition date	0	15	153
Restructuring expenses related to acquisition, since acquisition date			105
Acquisition-related costs, since acquisition date			15
Payments for integration costs	1	19
Incurred restructuring costs	6	8
Restructuring payments	4	$ 23
Salix | Integration Costs
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	6		6
Salix | Acquisition-Related Restructuring Costs
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	$ 11		$ 11