GOODWILL AND CORE DEPOSIT INTANGIBLES - Schedule of Changes in Core Deposit Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]
Amortization for the period	$ (63)	$ (57)	$ (23)
Core deposit intangible
Finite-lived Intangible Assets [Roll Forward]
Core deposit intangibles, beginning balance	312	140
Amortization for the period	63	58
Core deposit intangibles, ending balance	249	312	$ 140
Core deposit intangible | SVBB
Finite-lived Intangible Assets [Roll Forward]
Core deposit intangibles related to the SVBB Acquisition	$ 0	$ 230