RESTRUCTURING AND INTEGRATION COSTS - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Acquisition-Related Restructuring Costs
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	$ 28
Other Restructuring, Integration-related and Other Costs
Cost-rationalization and integration initiatives
Incurred restructuring costs	28	$ 16
Severance costs	8	8
Business exit costs	9	8
Restructuring payments	27	$ 29
Other Restructuring, Integration-related and Other Costs | Synergy Pharmaceuticals Inc.
Cost-rationalization and integration initiatives
Severance costs	$ 11