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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	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator (basic and diluted):
Income from continuing operations	$ 192	$ 275	$ 210	$ 133	$ 158	$ 163	$ 211	$ 107	$ 810	$ 639	$ 636
Less: Allocation to unvested restricted stock awards									6	4	6
Income from continuing operations attributable to common shareholders									804	635	630
Income from discontinued operations, net									414	296	98
Less: Allocation to unvested restricted stock awards									3	2	1
Income from discontinued operations, net attributable to common shareholders									411	294	97
Income from continuing operations attributable to common shareholders									$ 1,215	$ 929	$ 727
Denominator:
Basic common shares (based upon weighted average) (in shares)									264	287	305
Add: Stock option dilution (in shares)									0	1	2
Diluted common shares (in shares)									264	288	307

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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