FAIR VALUE MEASUREMENTS - Rollforward on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1	$ 2
Purchases, issuances, sales and settlements:
Purchases	3	5
Settlements	(1)	(6)
Balance at end of period	3	1
Interest Rate Lock Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1	2
Purchases, issuances, sales and settlements:
Purchases	3	5
Settlements	(1)	(6)
Balance at end of period	$ 3	$ 1