EARNINGS PER COMMON SHARE - Computation of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 83	$ 103	$ 214	$ 292
Less: Preferred stock dividends	2	2	6	6
Net Income Available to Common Stockholders	$ 81	$ 101	$ 208	$ 286
Basic weighted average common shares outstanding (in shares)	323,379,720	325,031,140	323,642,925	324,875,436
Net effect of dilutive stock options, warrants and restricted stock (in shares)	2,283,060	1,068,730	2,051,221	893,725
Diluted weighted average common shares outstanding (in shares)	325,662,780	326,099,870	325,694,146	325,769,161
Earnings per common share:
Basic (in USD per share)	$ 0.25	$ 0.31	$ 0.64	$ 0.88
Diluted (in USD per share)	$ 0.25	$ 0.31	$ 0.64	$ 0.88