FAIR VALUE MEASUREMENTS - Rollforward on Recurring Basis (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Purchases, issuances, sales and settlements:
Transfers from Level 3	$ 0	$ 0
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	9,000,000	$ 9,000,000
Purchases, issuances, sales and settlements:
Issuances	1,000,000
Settlements	(1,000,000)		(10,000,000)
Purchases			2,000,000
Transfers from Level 3			(1,000,000)
Balance at end of period	0		0
Fair Value, Recurring | Other Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	0	0
Purchases, issuances, sales and settlements:
Issuances	0
Settlements	0		(1,000,000)
Purchases			2,000,000
Transfers from Level 3			(1,000,000)
Balance at end of period	0		0
Fair Value, Recurring | Interest Rate Lock Commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	$ 9,000,000	9,000,000
Purchases, issuances, sales and settlements:
Issuances	1,000,000
Settlements	(1,000,000)		(9,000,000)
Purchases			0
Transfers from Level 3			0
Balance at end of period	$ 0		$ 0