RESTRUCTURING AND INTEGRATION COSTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquisition-Related Restructuring Costs
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	$ 31
Other Restructuring, Integration-related and Other Costs
Cost-rationalization and integration initiatives
Incurred restructuring costs	20	$ 6
Severance costs	6	4
Business exit costs	4	2
Restructuring payments	16	$ 6
Other Restructuring, Integration-related and Other Costs | Synergy Pharmaceuticals Inc.
Cost-rationalization and integration initiatives
Severance costs	$ 10