EARNINGS PER SHARE (Reconciliation of Basic and Diluted Earnings (Loss) per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders (in millions)	$ 142	$ 30	$ (112)	$ 36	$ 86	$ 86	$ 1	$ (2)	$ 96	$ 171	$ (30)
Weighted average common shares outstanding - basic (in shares)	34,702	34,686	34,626	34,484	34,553	34,562	34,506	34,465	34,625	34,514	34,432
Dilutive shares from stock awards (in shares)									509	582	0
Weighted average common shares outstanding - diluted (in shares)	35,232	35,137	34,626	35,225	35,288	35,051	34,829	34,465	35,134	35,096	34,432
Basic income (loss) (usd per share)	$ 4.10	$ 0.86	$ (3.23)	$ 1.05	$ 2.49	$ 2.49	$ 0.03	$ (0.06)	$ 2.78	$ 4.97	$ (0.87)
Diluted income (loss) (usd per share)	$ 4.04	$ 0.85	$ (3.23)	$ 1.03	$ 2.44	$ 2.45	$ 0.03	$ (0.06)	$ 2.74	$ 4.88	$ (0.87)