RESTRUCTURING AND INTEGRATION COSTS - Salix Acquisition-Related Cost-Rationalization and Integration Initiatives (Details) $ in Millions	12 Months Ended			21 Months Ended
	Dec. 31, 2016 USD ($) employee	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)
Cost-rationalization and integration initiatives
Acquisition-related contingent consideration	$ 2	$ 39	$ 6
Salix
Cost-rationalization and integration initiatives
Estimated integration related costs				$ 300
Restructuring and acquisition-related costs since acquisition date				267
Integration expenses related to acquisition	$ 43	110		153
Restructuring expenses related to acquisition				99
Acquisition-related contingent consideration				$ 15
Approximate number of employees expected to be terminated | employee	475
Payments for merger costs	$ 25	$ 100