INCOME TAXES - Summary of Valuation Allowance Against Certain Foreign Net Deferred Tax Assets and State Net Operating Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowance of Deferred Tax Assets [Roll Forward]
Balance at beginning of year	$ 5,401	$ 5,434	$ 1,564
State	139	(43)	151
U.S.	905	139	2,159
Foreign	(2,629)	(129)	1,560
Balance at end of year	$ 3,816	$ 5,401	$ 5,434