DERIVATIVES - Schedule of Fair Value Hedges (Details) - Interest rate swap - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Interest And Dividend Income, Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	$ (39)	$ 116
Derivatives	39	(118)
Amounts related to interest settlements on derivatives	0	11
Total net interest income recognized on fair value hedges	0	9
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	0	(2)
Derivatives	0	2
Amounts related to interest settlements on derivatives	0	(2)
Total net interest income recognized on fair value hedges	$ 0	$ (2)