RESTRUCTURING ACTIVITIES (Activities of Restructuring Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Beginning balance	$ 9	$ 38
Income statement (income) expense	14	(3)
Cash payments	(16)	(25)
Other		(1)
Ending balance	7	9
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Beginning balance	9	37
Income statement (income) expense	14	(3)
Cash payments	(16)	(25)
Other		0
Ending balance	7	9
Facility-Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	0	1
Income statement (income) expense	0	0
Cash payments	0	0
Other		(1)
Ending balance	$ 0	$ 0