GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Core Deposit Intangibles, Customer Renewal Lists and Mortgage Servicing Rights (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 276	$ 215
Accumulated amortization	(187)	(173)
Net carrying amount	89	42
Core Deposit Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	258	197
Accumulated amortization	(173)	(160)
Net carrying amount	85	37
Customer Renewal Lists
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	18	18
Accumulated amortization	(14)	(13)
Net carrying amount	$ 4	$ 5