INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 24	$ 26	$ 15	$ 19
Additions based on tax positions related to the current year	0	12	15
Reductions for tax positions of prior years	(2)	(1)	(19)
Balance at end of year	$ 24	$ 26	$ 15	$ 19