FAIR VALUE MEASUREMENTS - Rollforward on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3	$ 1
Purchases, issuances, sales and settlements:
Issuances	22	3
Settlements	(3)	(1)
Balance at end of period	22	3
Interest Rate Lock Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3	1
Purchases, issuances, sales and settlements:
Issuances	22	3
Settlements	(3)	(1)
Balance at end of period	$ 22	$ 3