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RESTRUCTURING AND INTEGRATION COSTS - Narrative (Details) - Restructuring and Integration-Related Costs - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cost-rationalization and integration initiatives
Remaining restructuring liabilities	$ 27
Restructuring costs	31	$ 22	$ 52
Severance costs	11	11	16
Facility closure costs	11	10	20
Other costs	9	1
Restructuring payments	$ 31	$ 33	85
Integration consulting, duplicate labor, transition service, and other			$ 16

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