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RESTRUCTURING ACTIVITIES (Pre-Tax Restructuring charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 14	$ (3)
Invigorate Program
Restructuring Cost and Reserve [Line Items]
Employee separation costs	14	(3)	$ 45
Facility-related costs	0	1	4
Asset impairment charges	0	0	2
Total restructuring charges	$ 14	$ (2)	$ 51

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