INCOME PER COMMON SHARE - Reconciliations of the Numerators and Denominators Used in the Computations of Basic and Diluted Earnings per Common Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator (basic and diluted):
Income from continuing operations	$ 410	$ 810	$ 639
Less: Allocation to redeemable noncontrolling interest	2	0	0
Less: Allocation to unvested restricted stock awards	2	6	4
Income from continuing operations attributable to common shareholders	406	804	635
Income from discontinued operations, net	0	414	296
Less: Allocation to unvested restricted stock awards	0	3	2
Income from discontinued operations, net attributable to common shareholders	0	411	294
Income from continuing operations attributable to common shareholders	$ 406	$ 1,215	$ 929
Denominator:
Basic common shares (based upon weighted average) (in shares)	249	264	287
Add: Stock option dilution (in shares)	2	0	1
Diluted common shares (in shares)	251	264	288