EARNINGS PER COMMON SHARE - Computation of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 84	$ 95	$ 131	$ 189
Less: Preferred stock dividends	2	2	4	4
Net Income Available to Common Stockholders	$ 82	$ 93	$ 127	$ 185
Basic weighted average common shares outstanding (in shares)	323,304,237	324,950,162	323,775,973	324,796,294
Net effect of dilutive stock options, warrants and restricted stock (in shares)	1,848,335	999,191	1,939,894	900,927
Diluted weighted average common shares outstanding (in shares)	325,152,572	325,949,353	325,715,867	325,697,221
Earnings per common share:
Basic (in USD per share)	$ 0.25	$ 0.29	$ 0.39	$ 0.57
Diluted (in USD per share)	$ 0.25	$ 0.29	$ 0.39	$ 0.57