SHARE-BASED COMPENSATION PROGRAMS - Summary of Compensation Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Expenses	$ 36	$ 28	$ 30
Income Tax Benefit	7	10	8
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Expenses	13	10	12
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Expenses	5	3	2
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Compensation Expenses	$ 18	$ 15	$ 16